travel advisor levels

Places the U.S. Government Warns Not to Travel Right Now

You may want to reconsider traveling to these countries right now.

Do Not Travel to These Countries

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Crime, civil unrest and terrorism are common risk factors for countries that end up on the State Department's "Do Not Travel" advisory list.

In 2024, tourism across the globe is “well on track” to return to pre-pandemic levels, according to projections by UN Tourism.

Global conflicts and natural disasters , ranging from a series of coups across Africa to catastrophic earthquakes in the Middle East affected international travel patterns throughout 2023. Still, international tourist arrivals reached 87% of pre-pandemic levels in 2023, according to estimates by UN Tourism .

In January 2024 alone, about 4.6 million U.S. citizens left the country for international destinations, 17% higher than the same month in 2019, according to the International Trade Administration . But some destinations warrant more caution than others.

On Oct. 19, 2023, following the outbreak of war between Israel and Gaza and flaring tensions in the region, the U.S. State Department issued a worldwide caution advisory due to “increased tensions in various locations around the world, the potential for terrorist attacks, demonstrations or violent actions against U.S. citizens and interests.” Prior to this update, the most recent worldwide caution advisory was issued in 2022 after a U.S. strike killed Ayman al-Zawahiri, Osama bin Laden’s successor as leader of Al Qaeda, causing “a higher potential for anti-American violence.” The worldwide caution advisory remains in effect.

The U.S. State Department also issues individual travel advisory levels for more than 200 countries globally, continually updating them based on a variety of risk indicators such as health, terrorism and civil unrest. Travel advisory levels range from Level 1, which means exercise normal precautions, to Level 4, which means do not travel there.

About 10% of countries – 19 total – have a Level 4: “Do Not Travel” advisory as of Mar. 4. In Level 4 countries, the U.S. government may have “very limited ability” to step in should travelers’ safety or security be at risk, according to the State Department. Crime, civil unrest, kidnapping and terrorism are common risk factors associated with Level 4 countries.

So far in 2024, the State Department made changes to the existing Level 4 advisories for Myanmar, Iran and Gaza, and moved Niger and Lebanon off of the Level 4 list.

Places With a Level 4 Travel Advisory

These are the primary areas the U.S. government says not to travel to right now, in alphabetical order:

Jump to Place: Afghanistan Belarus Burkina Faso Central African Republic Myanmar (formerly Burma) Gaza Haiti Iran Iraq Libya Mali Mexico North Korea (Democratic People's Republic of Korea) Russia Somalia South Sudan Sudan Syria Ukraine Venezuela Yemen

Afghanistan: The Central Asian country is wrestling with “terrorism, risk of wrongful detention, kidnapping and crime,” according to the State Department. U.S. citizens are specifically at risk for wrongful detention and kidnapping. In 2022, the government reinstituted public floggings and executions, and women’s rights are disappearing under Taliban control. The U.S. Embassy in Kabul halted operations in August 2021. Since the Taliban took control , many forms of international aid have been halted . Meanwhile, in 2023, some of the year’s deadliest earthquakes killed more than 2,400 in Afghanistan while the country continues to face a years-long extreme drought.

Belarus: Belarus, which shares a western border with Russia and a southern border with Ukraine, has been flagged for “Belarusian authorities’ continued facilitation of Russia’s war against Ukraine, the buildup of Russian military forces in Belarus, the arbitrary enforcement of local laws, the potential of civil unrest, the risk of detention, and the Embassy’s limited ability to assist U.S. citizens residing in or traveling to Belarus.” The U.S. Embassy in Minsk halted operations in February 2022.

Burkina Faso: Terrorism, crime and kidnapping are plaguing this West African nation. Terrorist attacks may target hotels, restaurants and schools with little to no warning, and the East and Sahel regions of the country are under a state of emergency. In late November 2023, hundreds died in clashes between state security forces and rebels near the country’s border with Mali. In June, more than 2 million people in Burkina Faso were displaced due to “violence linked to al-Qaida and the Islamic State group.”

Central African Republic: While there have not been specific incidents of U.S. citizens targeted with violence or crime, violent crime and sudden closure of roads and borders is common. The advisory states that “Embassy Bangui’s limited capacity to provide support to U.S. citizens, crime, civil unrest, and kidnapping” is a factor in its assessment. Recent data from UNICEF suggests the country has the worst drinking water accessibility of all countries in 2022.

Myanmar (Formerly Burma): Armed conflict and civil unrest are the primary reasons to not travel to this Southeast Asian country, which experienced a military coup in early 2021. Limited health care resources, wrongful detentions and “areas with land mines and unexploded ordnance” are also listed as risk factors. After Ukraine and Israel, Myanmar had the highest conflict-related death toll in 2023.

Gaza : Hamas, a foreign terrorist organization as designated by the State Department, controls much of the Gaza Strip, which shares borders with both Israel and Egypt. On Oct. 7, 2023, Hamas fighters broke across the border into Israel, killing hundreds of civilians and soldiers in a brazen attack that stunned Israelis. On Oct. 10, Israel hit the Gaza Strip with “the fiercest air strikes in its 75-year conflict” according to Reuters . The conflict has since escalated into war between Israel and Hamas, with regular Israeli airstrikes leading to extensive civilian casualties in Gaza. As of mid-December, nearly 85% of Gaza’s population were displaced from their homes, according to UN estimates . The region continues to face shortages of food , water, electricity and medical supplies , with conditions deemed “far beyond a humanitarian crisis.” The State Department warns of terrorism and armed conflict within Gaza’s borders.

Haiti: In July 2023, the Department of State ordered all non-emergency U.S. government personnel and family members to leave the U.S. Embassy in Port-au-Prince in response to the increased risk of kidnapping and violent crime in the country , as well as armed conflict between gangs and police. The travel advisory states that cases of kidnapping “often involve ransom negotiations and U.S. citizen victims have been physically harmed during kidnappings.” The travel advisory also states that “U.S. citizens in Haiti should depart Haiti as soon as possible” given “the current security situation and infrastructure challenges.” A series of gang attacks in late September 2023 caused thousands to flee their homes, and many aid groups have been forced to cut or suspend operations amid escalating violence in recent months.

Iran: Terrorism, kidnapping and civil unrest are risk factors for all travelers to Iran, while U.S. citizens are specifically at risk for “arbitrary arrest.” U.S.-Iranian nationals such as students, journalists and business travelers have been arrested on charges of espionage and threatening national security. Executions in Iran rose sharply between 2021 and 2022, bringing the country’s total to nearly 580 people over the year, according to a report by Amnesty International released in May 2023.

Iraq: The State Department cites “terrorism, kidnapping, armed conflict [and] civil unrest” as cause for the country’s Level 4 distinction. Iraq’s northern borders, and its border with Syria, are especially dangerous. Since the escalation of conflict in neighboring Israel in October, there has been an increase in attacks against Iraqi military bases, which host U.S. troops and other international forces. In October 2023, non-emergency U.S. government personnel and eligible family members were ordered to leave the U.S. embassy in Baghdad.

Libya: Following the end of its dictatorship over a decade ago, Libya has been wrought with internal conflict between armed groups in the East and West. Armed conflict, civil unrest, crime, kidnapping and terrorism are all risk factors. U.S. citizens have been targets of kidnapping for ransom, with terrorists targeting hotels and airports frequented by Westerners. The U.S. Embassy in Tripoli halted operations in 2014. In mid-September 2023, floods, which some say were intensified by climate change , killed thousands in eastern Libya. Clashes between armed factions escalated across the country in the latter half of 2023, including in the capital city of Tripoli and in Benghazi.

Mali: After experiencing military coups in 2020 and 2021, crime, terrorism and kidnapping are all prevalent threats in this West African landlocked nation. In July 2022, non-emergency U.S. government employees and their families were ordered to leave the country due to higher risk of terrorist activity. A U.N. report in August 2023 said that military groups in the country, including both Mali security forces and possibly Russian Wagner mercenaries, were spreading terror through the use of violence against women and human rights abuses. Democratic elections were supposed to occur in February 2024, but Mali’s military junta postponed the plans indefinitely. In December, the U.N. officially ended a decade-long peacekeeping presence in the country, which had been among the agency’s deadliest missions, with hundreds of the mission personnel killed since 2013.

Mexico: Each state in Mexico is assessed separately for travel advisory levels. Six of the 32 states in Mexico are designated as Level 4: Colima, Guerrero, Michoacan, Sinaloa, Tamaulipas and Zacatecas. Crime and kidnapping are listed as the primary risk factors throughout the country. Nearly 112,000 people were missing across the country as of October, a number the U.N. has called “alarming.”

North Korea (Democratic People’s Republic of Korea): U.S. passports are not valid for travel “to, in, or through” this country, home to one of the world's longest-running dynastic dictatorships. The travel advisory states that the Level 4 distinction is due to “the continuing serious risk of arrest and long-term detention of U.S. nationals.” In July 2023, a U.S. soldier fled across the border into North Korea, where he is believed to be in North Korean custody, the first American detained in the North in nearly five years. He was returned to U.S. custody in September 2023.

Russia: The travel advisory for Russia cites its invasion of Ukraine , harassment of U.S. citizens by Russian government officials and arbitrary law enforcement as a few of the reasons for the Level 4 designation. Chechnya and Mount Elbrus are specifically listed as Level 4 regions. Terrorism, civil unrest, health, kidnapping and wrongful detention are all noted as risks.

Russia Invades Ukraine: A Timeline

Somalia: A severe drought resulting from five failed rainy seasons in a row killed 43,000 people in 2022, and caused a famine amid conflict with Islamist insurgents . Violent crime is common throughout Somalia , pirates frequent its coast off the Horn of Africa, and medical facilities, where they exist, have limited capacity. Crime, terrorism, civil unrest, health and kidnapping are all risk factors. In January 2024, some passengers aboard a U.N.-contracted helicopter were taken hostage by al-Shabaab militants after the vehicle crashed in central Somalia.

South Sudan: Crime, kidnapping and armed conflict are the primary risk factors for South Sudan, which separated from Sudan in 2011, making it the world’s newest country . Weapons are readily available, and travelers have been victims of sexual assault and armed robbery.

Sudan: The U.S. evacuated its embassy in Khartoum in April 2023, and the country closed its airspace due to the ongoing conflict in the country, only permitting humanitarian aid and evacuation efforts. Fighting has escalated in the region between two warring generals seeking to gain control after a military coup in 2021 ousted the country’s prime minister. Civil unrest is the primary risk factor for Africa’s third largest country by area. Crime, terrorism, kidnapping and armed conflict are also noted. The International Criminal Court began investigating alleged war crimes and violence against African ethnic groups in the country in 2023. Millions have fled their homes due to conflict, and the U.N. has said its efforts to provide aid have been hindered by a lack of support, safety and resources. As recently as December 2023, the United Nations warned of catastrophic famine , with millions of children at-risk for malnutrition .

Syria: The advisory states that “No part of Syria is safe from violence,” with terrorism, civil unrest, kidnapping, armed conflict and risk of unjust detention all potential risk factors. U.S. citizens are often a target for kidnappings and detention. The U.S. Embassy in Damascus halted operations in 2012. Fighting in neighboring Israel has escalated since October, and the conflict has spilled over into Syria, where the U.S. has carried out air strikes following drone and rocket attacks against American troops in Syria and Iraq, triggered by the Israel-Hamas war.

Ukraine: Russian setbacks in their invasion of Ukraine buoyed hopes in Ukraine in 2023. However, Ukraine is a Level 4 country due to Russia’s invasion, with crime and civil unrest also noted as risk factors. The country’s forces shot down two Russian fighter jets on Christmas Eve 2023, in a move Ukrainian President Volodymyr Zelenskyy said “sets the right mood for the entire year ahead.”

Venezuela: Human rights abuses and lack of health care plague this South American nation, which has been in a political crisis since 2014. In 2019, diplomatic personnel were withdrawn from the U.S. Embassy in Caracas. Threats in the country include crime, civil unrest, kidnapping, wrongful detention and poor health infrastructure.

Yemen: Six of the nine risk factors defined by the State Department – terrorism, civil unrest, health risks, kidnapping, armed conflict and landmines – are all present in Yemen. Despite private companies offering tourist visits to the Yemeni island of Socotra, the U.S. government argues those arranging such visits “are putting tourists in danger.” Civil war and cholera are also both present throughout the country. The U.S. Embassy in Sanaa halted operations in 2015. The country has experienced a relative lull in the civil war fighting, but as peace negotiations have gotten traction, flare ups in the fighting have jeopardized progress. Most recently, the U.S. and U.K. have carried out a series of airstrikes in the country, targeting Iran-backed Houthi sites.

Other Countries to Watch

Since Jan. 1, the State Department has updated travel advisories for 17 different countries as well as for the West Bank and Gaza, adding information about specific regions or risk factors, or simply renewing an existing advisory. Travel advisory levels can change based on several factors in a nation, such as increased civil unrest, policies that affect human rights or higher risks of unlawful detention.

The State Department has given about 25 countries an assessment of Level 3, meaning it recommends people “reconsider travel” to those destinations.

On Oct. 14, one week after the deadly Hamas attack on Israel, Israel and the West Bank were both moved from Level 2 to Level 3, while Gaza remains at Level 4. The region’s travel advisory was updated in November to reflect travel restrictions for certain government employees who have not already left the area, and it was updated again on Jan. 3.

Following the outbreak of the Israel-Hamas war in early October, the U.S. State Department raised Lebanon ’s travel advisory level from a Level 3 to a Level 4 level due to “the unpredictable security situation related to rocket, missile, and artillery exchanges” between Israel and Hezbollah or other militant groups. In December, the U.S. Embassy in Beirut returned to normal staffing and presence, and on Jan. 29, the country was moved back to Level 3. Crime, terrorism, armed conflict, civil unrest, kidnapping and unexploded landmines are listed as the country’s primary risk factors. However, the country’s borders with Syria and with Israel, as well as refugee settlements within Lebanon, are specifically noted as Level 4 regions.

China became a Level 3 country in late 2020, with an update in December 2022 citing “the surge in COVID-19 cases, arbitrary enforcement of local laws, and COVID-19-related restrictions” as the reason for the advisory. In June 2023, the Hong Kong Special Administrative Region (SAR) was moved from the Level 3 to the Level 2 list, but travelers are still advised to be cautious in the area due to “arbitrary enforcement of local laws.” Meanwhile, Macau remains at Level 3.

Following an attempted coup in August 2023, Niger was elevated to Level 4 in August and the Department of State ordered all non-emergency U.S. government personnel and family members to leave the U.S. Embassy in Niamey. In early January 2024, the overall risk level for the country was lowered back to Level 3. Despite the new classification, the State Department still asks non-emergency government personnel and eligible family members to depart the country.

In mid-December 2023 there was an explosion at Guinea’s main fuel depot which has since affected access to health care and basic goods and services. The country was subsequently designated a Level 3 nation after having previously been Level 2. Concerns about civil unrest, health, crime and fuel shortages impacting local infrastructure were listed as the primary risk factors contributing to the change.

Several Level 3 countries are among the worst countries for human trafficking, as designated by the State Department’s annual Trafficking in Persons Report . Level 3 countries on this list include Papua New Guinea, Guinea Bissau, China and Chad. There are also nine Level 4 countries designated as among the worst for human trafficking: Afghanistan, Belarus, Iran, Myanmar, North Korea, Russia, Syria, South Sudan and Venezuela.

Over 70 countries are currently at Level 2, meaning the State Department recommends travelers “exercise increased caution” when traveling to those destinations.

Botswana became the newest Level 2 country on Feb. 26 after having previously been Level 1, with crime noted as the primary risk factor.

France, which saw nationwide protests throughout 2023, has civil unrest and terrorism noted as risk factors for its Level 2 status, and Sweden’s Level 2 status is associated with risks of terrorism.

The Level 2 travel advisory for the Bahamas was updated in January to reflect water safety concerns. The advisory warns that “activities involving commercial recreational watercraft, including water tours, are not consistently regulated” and notes that government personnel are “not permitted to use independently operated jet-ski rentals on New Providence and Paradise Islands.” It also warns visitors to be mindful of sharks, weather and water conditions. The advisory also says that crime is a primary risk factor with gang-on-gang violence contributing to high homicide rates in some areas. Visitors are asked to “be vigilant” and to not physically resist robbery attempts.

Bangladesh 's Level 2 travel advisory was updated in October 2023 to add a note about the country’s general election , which took place Jan. 7, 2024. The advisory states “demonstrations intended to be peaceful can turn confrontational and escalate into violence.” The U.S. has since claimed the country’s election was not free nor fair.

In November 2023, several Level 2 travel advisories were updated with new cautionary information. The advisory for Ghana was updated to reflect threats against LGBTQI+ travelers specifically, noting “anti-LGBTQI+ rhetoric and violence have increased in recent years.” Meanwhile, the advisory for South Africa was updated in February to note that routes recommended by GPS may be unsafe with higher risk for crime.

Turkmenistan was moved off of the Level 2 list to become the newest addition to the Level 1 list on Jan. 22, meaning normal precautions are recommended but there are no risk factors causing travelers to practice increased caution.

The State Department asks travelers to pay attention to travel advisory levels and alerts , review country information pages for their destinations and read related country security reports before going abroad.

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Tags: Russia , Ukraine , Travel , Coronavirus , Travel Tips , Israel , Gaza , violence , Civil War , crime , kidnapping

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Is it safe to go there? The U.S. travel advisory system, explained

If you’re planning an international trip, here’s how to use the State Department’s country-by-country guide to minimize your risk of encountering crime, violence, or civil unrest.

On October 19, the U.S. Department of State issued a rare advisory that Americans overseas “exercise increased caution” due to heightened tensions and chances of terrorism around the world, spurred by the Israel-Hamas war. It’s part of a system of travel warnings that’s been around in some form since 1978, designed to help citizens assess how safe a destination might be at a given time.

The current version of the system, which launched in 2018, gives fluid rankings from Level 1 (exercise normal precautions) to Level 4 (do not travel), indicating how risky countries (and in some cases, regions) are for Americans to visit. Rankings are based on factors such as crime rates, civil unrest, and the threat of terrorism. They are meant to give “clear, timely, and reliable information about every country in the world so they can make informed travel decisions,” says a State Department spokesperson.  

Not surprisingly, on October 14, the State Department moved Israel and the West Bank to Level 3 (reconsider travel) and Gaza to Level 4.  

Here’s how the advisories work and how to use them.

What is a travel advisory?

The U.S. State Department inaugurated the travel advisory system in 1978, initially aiming warnings at airlines and travel companies. The system was scrutinized after the 1988 bombing of a Pan Am flight from London to New York , which exploded over Lockerbie, Scotland , killing all 259 passengers and crew plus 11 people on the ground.  

Investigations found U.S. authorities had been aware of a credible threat to a Pan Am flight but hadn’t informed the public. In response, the media and consular offices began issuing travel warnings. In 2018 the U.S. introduced its current four-tier advisory system. There are near-identical versions in Canada , Australia , and New Zealand .

To determine rankings, the State Department considers a nation’s political volatility, crime trends, medical care standards, and the threat of kidnappings or terrorism. (Politics also ends up playing an unspoken role.) Some countries, such as Russia , receive a Level 4 ranking partly because the U.S. government may have limited ability to assist citizens there. Others rise to Level 4 due to a crisis, such as the military coup that recently rocked Niger .  

When the travel advisory system relaunched in 2018, it also included state-by-state evaluations for Mexico , which draws more than 11 million American travelers a year. “Some Mexican states are quite safe for U.S. tourists, while others are riskier due to narco-trafficking violence,” says Ryan Larsen , executive director of the Institute for Global Engagement at Western Washington University. Yucatán and Campeche states are currently at Level 1, while six other Mexican states are at Level 4, including Sinaloa.

( Solo female travelers share tips for staying safe on the road .)

Epidemics and natural disasters also can prompt a travel advisory number to rise. Americans may be prompted to reconsider visiting a country recovering from a tsunami or major wildfires, since their presence could hinder rehabilitation efforts. This occurred after the February 2023 earthquakes in Turkey . Such advisories can remain in place for weeks or months.

The strictest-ever advisories came in April 2021, amid the COVID-19 pandemic , says Larsen, who did a thesis   on U.S. travel warnings. At that time, about 80 percent of the world’s countries were at Level 4.

At press time, about 70 percent of the world’s countries were rated Level 1 or Level 2 by the State Department, indicating they’re relatively safe. There are currently 21 countries at Level 3 and 21 at Level 4.

How to use travel advisories

Before booking an international trip, consult the State Department website to see where your destination ranks. While Level 1 and 2 countries are considered relatively safe, you should still register with the U.S. Smart Traveler Enrollment Program (STEP) . This lets Americans overseas use their smartphone to receive travel advisory updates and alerts about emerging dangers in their destination (protests, extreme weather).

Level 3 countries are considered more dangerous for foreign visitors, who should “reconsider travel,” according to the State Department. If you are headed to a Level 3 country, which currently includes Pakistan and Colombia , do wider research on its safety and on the places you’ll visit there, advises Jun Wen , a professor of tourism at Australia’s Edith Cowan University. For instance, while some remote areas in the Colombian Amazon still suffer from drug-related violence, cities such as Cartagena and Medellín are relatively safe. Going on a fully guided group or individual tour can also help you navigate destinations where political unrest or crime might impact your safety.

Travelers should study not only the advisories provided by their own country, but also by the U.S., United Kingdom, and Australia to broaden their understanding of the risks in Level 3 countries, Wen says. As for Level 4 countries, that “Do Not Travel” advice couldn’t be any clearer.

Other countries also issue warnings to their citizens about visiting the U.S. Canada recently informed its LGBTQ travelers they may be affected by laws in certain U.S. states. Australia, meanwhile, cautions its citizens visiting the U.S. to be wary of higher crime rates and gun violence, and even to learn safety strategies for active shooter scenarios.

People who visit countries with Level 3 or Level 4 travel advisories don’t just risk their safety. They also may have travel insurance complications, says Linchi Kwok , tourism management professor at California State Polytechnic University Pomona.

( How travel insurance can—and can’t—help when your plans change .)

They must pay much higher premiums, and their insurance can be invalidated if the advisory for their destination is elevated. “Medical coverage can be minimal, too, particularly if the travel advisory is put up against a disease or an outbreak,” says Kwok. “I encourage Americans to think twice before they travel to Level 3 and especially Level 4 destinations.”

Warnings and their impact on tourism

Travel advisories can be biased, Larsen argues. His research found that, while the U.S. didn’t often overstate the risk of travel to countries with which it had poor relations, it did often understate the danger of visiting nations that were its close allies. Elevating a travel advisory can stoke diplomatic tensions between two countries. Once a country is raised to Level 3 or 4, many tourists will avoid visiting, and many American universities won’t let students join study abroad programs.

The economic ramifications of a level change impact individual businesses such as hotels, restaurants, and travel agencies. For instance, J 2   adventures , a Jewish-focused tour company, saw most of its fall group trips to Israel canceled after the start of the Israel-Hamas war (and the higher advisory level), says cofounder Guy Millo. “This is not just because of the violence on the ground, but because of practical considerations like accessibility of commercial airline flights,” he says. “Most tourists from North America and places around the globe simply couldn’t get here even if they wanted to.”  

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17 Countries Got New Travel Advisory Levels From the CDC This Week

Say it ain't so

On Aug. 30, 2021, the U.S. Centers for Disease Control and Prevention recently upgraded seven countries to a " Level 4: Very High " risk for COVID-19 on its list of Travel Health Notices. The Level 4 designation is the highest possible category, and the CDC recommends travelers avoid all travel to the destination.

New Level 4 countries include the two U.S. territories of Puerto Rico and Guam, and foreign countries inclusive of Switzerland, Azerbaijan, St. Lucia, North Macedonia, and Estonia. It also upped the risk status of several other countries, including Canada, Bermuda, and Germany, to "Level 3: High," urging travelers to make sure they are fully vaccinated before traveling to these areas or to avoid all non-essential travel if you are unvaccinated.

The newest CDC travel advisory updates come on the heels of last week’s changes which saw upgraded "Level 4: Do Not Travel" warnings placed on six countries, mostly in the Caribbean or the Middle East—Haiti, Sint Maarten, Bahamas, Kosovo, Lebanon, and Morocco. A closer look at this week’s new numbers reveals that the total number of countries designated at a Level 3 or Level 4 have only increased by three since last week. It’s also worth noting that Indonesia actually dropped from a Level 4 down to a Level 3.

Still, on the surface, it may not seem like much—what with 195 countries across the globe—however, the bigger picture places more than 78 percent of the world's countries within the top two tiers of the CDC's Travel Health Notices.

Plus, the U.S. isn’t the only country that has been shuffling around travel safety ranks due to COVID-19. Less than 24 hours before the CDC and State Department’s upgrades, the European Union (EU) announced it would be removing six countries from its safe travel list, including the United States from its safe travel list (we had a good two-month run). Other countries kicked off the current list include North Macedonia, Israel, Kosovo, Montenegro, and Lebanon.

During August, rising local COVID-19 cases caused the CDC to add 40 global destinations to its Level 4 advisory list. A destination is slapped with a "Very High" Level 4 Travel Health Notice when it has over 500 new COVID-19 cases per 100,000 people over a 28-day period (or just more than 500 new cases total for destinations with populations less than 100,000).

For an interactive worldwide map of the CDC’s COVID-19 travel advisories, visit the official site. 

European Commission. "Travel During the Coronavirus Pandemic."

• Centers for Disease Control and Prevention. "How CDC Determines the Level for COVID-19 Travel Health Notices." June 7, 2021

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• Health & Safety
• Travel Security

Evaluating the U.S. Department of State Travel Advisory System

Many colleges and universities, including Northwestern, pay close attention U.S. Department of State (DOS) consular announcements, which are disseminated to the public to help assess travelers’ risks. It’s important for travelers to understand the different announcement types and sources.

The Consular Travel Advisory System

Under new DOS Travel Advisory system every country is assigned a color-coded risk rating from one to four, defined as:

• Level 1 – Exercise Normal Precautions: This is the lowest advisory level for safety and security risk.
• Level 2 – Exercise Increased Caution: Be aware of heightened risks to safety and security. The Department of State provides additional advice for travelers in these areas in the Travel Advisory. 
• Level 3 – Reconsider Travel: Avoid travel due to serious risks to safety and security. The Department of State provides additional advice for travelers in these areas in the Travel Advisory. 
• Level 4 – Do Not Travel: This is the highest advisory level due to greater likelihood of life-threatening risks. During an emergency, the U.S. government may have very limited ability to provide assistance. The Department of State advises that U.S. citizens not travel to the country or leave as soon as it is safe to do so. The Department of State provides additional advice for travelers in these areas in the Travel Advisory.   

Additional country-specific information is provided in each advisory, including clearer, actionable steps for that travelers can take to mitigate risk. (See Risk Indicators below). The DOS will update the advisories as needed, based on changes to security and safety information.

Risk Indicators

By using established risk indicators, the Travel Advisories at levels 2-4 provide clear reasons for the level assigned:

• E - Time-Limited Event:  A short-term event, such as an election, sporting event or other incident that may post a safety risk.  
• C – Crime: Widespread violent or organized crime is present in areas of the country. Local law enforcement may have limited ability to respond to serious crimes.
• T – Terrorism: Terrorist attacks have occurred and/or specific threats against civilians, groups, or other targets may exist.
• U – Civil Unrest: Political, economic, religious, and/or ethnic instability exist and may cause violence, major disruptions, and/or safety risks.
• N – Natural Disaster: A natural disaster, or its aftermath, poses danger.
• H – Health: Health risks, including current disease outbreaks or a crisis that disrupts a country’s medical infrastructure, are present. The issuance of a Centers for Disease Control Travel Notice may be a factor.
• K– Kidnapping or Hostage Taking : Criminal or terrorist individuals or groups have threatened to and / or have seized or detained and threatened to kill,  injure or continue to detain individuals in order to compel a third party (including a governmental organization) to do or abstain from doing something as a condition of release.
• D – Wrongful Detention: The risk of wrongful detention of U.S. nationals by a foreign government exists.
• O – Other: There are potential risks not covered by previous risk indicators.

U.S. embassies and consulates will now issue Alerts to replace the Emergency Messages and Security Messages. Alerts will inform travelers of specific safety and security concerns in a country and will be labeled according to their issue: Security Alert; Health Alert; Weather Alert; or Demonstration Alert. Recent Alerts for a country appear below the Travel Advisory. Alerts can also be found on individual embassy or consulate websites.

Click here for an example of an embassy Alert message.

Additional Information

For an even more detailed description of these terms, please see the Overseas Security Advisory Council (OSAC) document, Understanding the Consular Travel Advisory System .

Global Travel Risk Map

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Travel advice and advisories by destination

COVID-19: travel health notice for all travellers

The Government of Canada’s official source of travel information and advice, the Travel Advice and Advisories help you to make informed decisions and travel safely while you are outside Canada. Check the page for your destination often, because safety and security conditions may change. See Travel Advice and Advisories – FAQ for more information.

Where are you going?

Take normal security precautions

Exercise a high degree of caution

Avoid non-essential travel

Avoid all travel

Travel advice from other countries

Travel advice is also provided by the governments of Australia , New Zealand , the United Kingdom and the United States .

Risk Levels

  take normal security precautions.

Take similar precautions to those you would take in Canada.

  Exercise a high degree of caution

There are certain safety and security concerns or the situation could change quickly. Be very cautious at all times, monitor local media and follow the instructions of local authorities.

IMPORTANT: The two levels below are official Government of Canada Travel Advisories and are issued when the safety and security of Canadians travelling or living in the country or region may be at risk.

  Avoid non-essential travel

Your safety and security could be at risk. You should think about your need to travel to this country, territory or region based on family or business requirements, knowledge of or familiarity with the region, and other factors. If you are already there, think about whether you really need to be there. If you do not need to be there, you should think about leaving.

  Avoid all travel

You should not travel to this country, territory or region. Your personal safety and security are at great risk. If you are already there, you should think about leaving if it is safe to do so.

These are the latest U.S. travel advisories for 2021

Editor's Note

The global coronavirus pandemic has impacted every country in the world and has even reach locations as far as Antarctica. As Americans (and countries around the world) are riding out the COVID-19 storm, it's important to revisit the travel advisories that have been issued by the U.S. Department of State, especially as these advisories are constantly being updated.

Sign up for our daily newsletter to stay informed on travel news

As of the time of this publication, 87 countries remain under a strict Level 4: Do Not Travel advisory.

Coronavirus

COVID-19 is still a worldwide threat . Americans experiencing COVID-19 related emergencies overseas should contact the nearest U.S. embassy or consulate, or call the State Department assistance call center:

• From the U.S. & Canada - 1-888-407-4747
• From Overseas - +1 202-501-4444
• Enroll in STEP — the Smart Traveler Enrollment Program

Related: Reopening soon? A country-by-country guide to coronavirus recovery

If you have existing travel plans already booked, keep a close eye on local travel restrictions and guidelines to minimize the further spread of the disease. The only type of travel insurance that offers a partial refund is " cancel for any reason " (CFAR) travel insurance. However, airlines are offering flexible schedule changes and refunds for disrupted travel .

Many countries still have travel restrictions and/or additional entry requirements for U.S. travelers entering foreign nations . Before you travel, be sure to check the requirements from the country or countries you plan to visit, in order to ensure you have all the documents and any testing you need. Otherwise, you may not be allowed to travel or worse yet, will be sent home upon arrival.

In order to help you keep up, TPG maintains a list of all the advisories that have been issued or updated as of July 2021, including all of the Level 4 advisories to date. You can also find the complete list of travel advisories on the State Department's website.

For information on travel advisories relating to COVID-19 issued by the CDC, check out our full guide here .

Level 4 advisories (Do Not Travel):

Afghanistan Algeria Antarctica Argentina Bahrain Bangladesh Belarus Bhutan Bolivia Botswana Brazil British Virgin Islands Burkina Faso Burma (Myanmar) Burundi Central African Republic Chile Colombia Costa Rica Cuba Cyprus Democratic Republic of the Congo Eritrea Fiji French Guiana Georgia Guinea-Bissau Haiti Indonesia Iran Iraq Kiribati Kuwait The Kyrgyz Republic Libya Macau Madagascar Malawi Malaysia Maldives Mali Mongolia Mozambique Namibia Nauru Nepal Netherlands Nicaragua North Korea (Democratic People's Republic of Korea) Oman Panama Papua New Guinea Paraguay Portugal Republic of the Congo Russia Rwanda Samoa Sao Tome and Principe Saudi Arabia Seychelles Sierra Leone Solomon Island Somalia South Africa South Sudan Spain Sudan Suriname Syria Tajikistan Tanzania Tonga Trinidad and Tobago Tunisia Turkmenistan Tuvalu Uganda United Arab Emirates United Kingdom Uruguay Uzbekistan Vanuatu Venezuela Yemen Zambia Zimbabwe

Level 3 advisories (Reconsider Travel):

Andorra Armenia Aruba Australia The Bahamas Belgium Belize Brunei Cabo Verde Cambodia Canada Cayman Islands Chad China Cote d'Ivoire Croatia Denmark Dominican Republic Ecuador Egypt Estonia Eswatini France The Gambia Greece Guatemala Guyana Honduras Hong Kong Hungary Iceland India Ireland Israel, The West Bank and Gaza Italy Jamaica Japan Jordan Kazakhstan Laos Latvia Lebanon Lesotho Liberia Luxembourg Malta Marshall Island Mauritius Mexico Micronesia Montenegro New Caledonia New Zealand Niger Nigeria Norway Pakistan Peru Philippines Poland Qatar Saint Kitts and Nevis Saint Lucia Saint Vincent and the Grenadines Sint Eustatius Sint Maarten Slovenia Sri Lanka Sweden Switzerland Taiwan Thailand Timor-Leste Togo Turkey

Level 2 advisories (exercise increased caution):

Albania Angola Austria Azerbaijan Barbados Benin Bonaire Bosnia and Herzegovina Cameroon Curacao Czech Republic El Salvador Ethiopia Finland French West Indies Germany Guinea Kenya Kosovo Lithuania Mauritania Micronesia Moldova Morocco Palau Senegal Serbia Singapore Turks and Caicos Ukraine Vietnam

Level 1 advisories (exercise normal precautions):

Anguilla Antigua and Barbuda Bermuda Bulgaria Comoros Djibouti Dominica Equatorial Guinea French Polynesia Gabon The Gambia Ghana Grenada Liechtenstein Montserrat North Macedonia Romania Saba Singapore Slovakia South Korea Togo

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Travel Health Notices

Search By Country Name or Disease

CDC uses Travel Health Notices (THNs) to inform travelers about global health risks during outbreaks, special events or gatherings, and natural disasters, and to provide advice about protective actions travelers can take to prevent infection or adverse health effects.

A THN can be posted for: 1) a disease outbreak (higher number of expected cases) in a country or region, 2) sporadic cases of a disease in an unusual or new geographic location, 3) natural and human-made disasters with severe environmental health risks, or infrastructure damage that would limit healthcare services availability and 4) mass gathering events that can lead to disease outbreaks. See types of travel notices .

Level 4 - Avoid All Travel

• Currently there are no Travel Health Notices at this level.

Level 3 - Reconsider Nonessential Travel

Level 2 - practice enhanced precautions.

• There are confirmed and suspect cases of diphtheria in several regions in Guinea. Vaccination against diphtheria is essential to protect against disease. If you are traveling to an affected area, you should be up to date with your diphtheria vaccines.Diphtheria in Guinea751 Diphtheria in Guinea April 23, 2024 There are confirmed and suspect cases of diphtheria in several regions in Guinea. Vaccination against diphtheria is essential to protect against disease. If you are traveling to an affected area, you should be up to date with your diphtheria vaccines. Read More >>
• There is an outbreak of chikungunya in Timor-Leste.Chikungunya in Timor-Leste759 Chikungunya in Timor-Leste April 05, 2024 There is an outbreak of chikungunya in Timor-Leste. Read More >>
• Yellow fever cases remain elevated in Nigeria, after an outbreak was first reported in November 2020. Travelers to Nigeria should take steps to prevent yellow fever by getting vaccinated at least 10 days before travel and taking steps to prevent mosquito bites.Yellow Fever in Nigeria392 Yellow Fever in Nigeria March 28, 2024 Yellow fever cases remain elevated in Nigeria, after an outbreak was first reported in November 2020. Travelers to Nigeria should take steps to prevent yellow fever by getting vaccinated at least 10 days before travel and taking steps to prevent mosquito bites. Read More >>
• There is an outbreak of diphtheria in Niger. If you are traveling to an affected area, you should be up to date with your diphtheria vaccines.Diphtheria in Niger752 Diphtheria in Niger February 25, 2024 There is an outbreak of diphtheria in Niger. If you are traveling to an affected area, you should be up to date with your diphtheria vaccines. Read More >>
• There is an outbreak of diphtheria in several states in Nigeria. Vaccination against diphtheria is essential to protect against disease. If you are traveling to an affected area, you should be up to date with your diphtheria vaccines.Diphtheria in Nigeria 740 Diphtheria in Nigeria February 16, 2024 There is an outbreak of diphtheria in several states in Nigeria. Vaccination against diphtheria is essential to protect against disease. If you are traveling to an affected area, you should be up to date with your diphtheria vaccines. Read More >>
• There is an outbreak of mpox in 22 out of 26 provinces, including urban areas, in the DRC.Mpox in the Democratic Republic of the Congo438 Mpox in the Democratic Republic of the Congo February 16, 2024 There is an outbreak of mpox in 22 out of 26 provinces, including urban areas, in the DRC. Read More >>
• Some international destinations have circulating poliovirus. Before any international travel, make sure you are up to date on your polio vaccines. Country List : Afghanistan, Algeria, Benin, Cameroon, Central African Republic, Chad, Côte d'Ivoire (Ivory Coast), Democratic Republic of the Congo, Israel, including the West Bank and Gaza, Madagascar, Malawi, Mozambique, Niger, Nigeria, Pakistan, Somalia, Yemen, Indonesia, Sudan, Mali, Botswana, Zambia, Republic of the Congo , Burundi, Burkina Faso, Kenya, Tanzania, including Zanzibar, Guinea, Mauritania, Egypt, ZimbabweGlobal Polio734 Global Polio January 05, 2024 Some international destinations have circulating poliovirus. Before any international travel, make sure you are up to date on your polio vaccines. Destination List: Afghanistan, Algeria, Benin, Botswana, Burkina Faso, Burundi, Cameroon, Central African Republic, Chad, Côte d'Ivoire (Ivory Coast), Democratic Republic of the Congo, Egypt, Guinea, Indonesia, Israel, including the West Bank and Gaza, Kenya, Madagascar, Malawi, Mali, Mauritania, Mozambique, Niger, Nigeria, Pakistan, Republic of the Congo, Somalia, Sudan, Tanzania, including Zanzibar, Yemen, Zambia, Zimbabwe Read More >>

Level 1 - Practice Usual Precautions

• There are outbreaks of Oropouche fever in parts of Brazil, Bolivia, and Peru. Travelers to affected areas should take steps to avoid bug bites. Country List : Brazil, Bolivia, PeruOropouche Fever in South America758 Updated   Oropouche Fever in South America April 24, 2024 There are outbreaks of Oropouche fever in parts of Brazil, Bolivia, and Peru. Travelers to affected areas should take steps to avoid bug bites. Destination List: Bolivia, Brazil, Peru Read More >>
• Dengue is a risk in many parts of Central and South America, Mexico, and the Caribbean. Some countries are reporting increased numbers of cases of the disease. Travelers to the Americas can protect themselves by preventing mosquito bites. Country List : Colombia, Guatemala, Nicaragua, Panama, Guadeloupe, Martinique (France), Costa Rica, French Guiana (France), Mexico, Turks and Caicos Islands (U.K.), Brazil, Paraguay, Argentina, Peru, Ecuador, including the Galápagos Islands, UruguayDengue in the Americas427 Dengue in the Americas April 18, 2024 Dengue is a risk in many parts of Central and South America, Mexico, and the Caribbean. Some countries are reporting increased numbers of cases of the disease. Travelers to the Americas can protect themselves by preventing mosquito bites. Destination List: Argentina, Brazil, Colombia, Costa Rica, Ecuador, including the Galápagos Islands, French Guiana (France), Guadeloupe, Guatemala, Martinique (France), Mexico, Nicaragua, Panama, Paraguay, Peru, Turks and Caicos Islands (U.K.), Uruguay Read More >>
• Dengue is a risk in many parts of Africa and the Middle East. Some countries are reporting increased numbers of cases of the disease. Travelers to Africa and the Middle East can protect themselves by preventing mosquito bites. Country List : Sudan, Burkina Faso, Mali, Ethiopia, Cape Verde, MauritiusDengue in Africa and the Middle East428 Dengue in Africa and the Middle East April 18, 2024 Dengue is a risk in many parts of Africa and the Middle East. Some countries are reporting increased numbers of cases of the disease. Travelers to Africa and the Middle East can protect themselves by preventing mosquito bites. Destination List: Burkina Faso, Cape Verde, Ethiopia, Mali, Mauritius, Sudan Read More >>
• Dengue is a risk in many parts of Asia and the Pacific Islands. Some countries are reporting increased numbers of cases of the disease. Travelers to Asia and the Pacific Islands can protect themselves by preventing mosquito bites. Country List : Sri Lanka, Malaysia, Cambodia, Indonesia, Laos, SingaporeDengue in Asia and the Pacific Islands429 Dengue in Asia and the Pacific Islands April 18, 2024 Dengue is a risk in many parts of Asia and the Pacific Islands. Some countries are reporting increased numbers of cases of the disease. Travelers to Asia and the Pacific Islands can protect themselves by preventing mosquito bites. Destination List: Cambodia, Indonesia, Laos, Malaysia, Singapore, Sri Lanka Read More >>
• Many international destinations are reporting increased numbers of cases of measles. Country List : Afghanistan, Angola, Benin, Cameroon, Central African Republic, Chad, Côte d'Ivoire (Ivory Coast), Democratic Republic of the Congo, Djibouti, Ethiopia, Gabon, India, Indonesia, Liberia, Niger, Nigeria, Pakistan, Republic of the Congo , Senegal, Somalia, Republic of South Sudan, Sudan, Tajikistan, Togo, Yemen, Zambia, Nepal, Kyrgyzstan, Armenia, Mauritania, Lebanon, Equatorial Guinea, Syria, Ghana, Kazakhstan, Burkina Faso, Turkey, Qatar, United Arab Emirates, Libya, Burundi, Romania, Malaysia, Russia, Azerbaijan, Sri Lanka, UzbekistanGlobal Measles743 Global Measles March 22, 2024 Many international destinations are reporting increased numbers of cases of measles. Destination List: Afghanistan, Angola, Armenia, Azerbaijan, Benin, Burkina Faso, Burundi, Cameroon, Central African Republic, Chad, Côte d'Ivoire (Ivory Coast), Democratic Republic of the Congo, Djibouti, Equatorial Guinea, Ethiopia, Gabon, Ghana, India, Indonesia, Kazakhstan, Kyrgyzstan, Lebanon, Liberia, Libya, Malaysia, Mauritania, Nepal, Niger, Nigeria, Pakistan, Qatar, Republic of South Sudan, Republic of the Congo, Romania, Russia, Senegal, Somalia, Sri Lanka, Sudan, Syria, Tajikistan, Togo, Turkey, United Arab Emirates, Uzbekistan, Yemen, Zambia Read More >>
• There are reports of Western equine encephalitis virus (WEEV) infections in horses, humans or both, in parts of Argentina and Uruguay. Country List : Argentina, UruguayWestern Equine Encephalitis Virus in South America760 Western Equine Encephalitis Virus in South America March 14, 2024 There are reports of Western equine encephalitis virus (WEEV) infections in horses, humans or both, in parts of Argentina and Uruguay. Destination List: Argentina, Uruguay Read More >>
• There have been reports of Rocky Mountain spotted fever (RMSF) in people traveling to the United States from Tecate, in the state of Baja California, Mexico.Rocky Mountain Spotted Fever in Mexico 756 Rocky Mountain Spotted Fever in Mexico March 12, 2024 There have been reports of Rocky Mountain spotted fever (RMSF) in people traveling to the United States from Tecate, in the state of Baja California, Mexico. Read More >>
• An outbreak of extensively drug-resistant (XDR) typhoid fever in Pakistan is ongoing. Extensively drug-resistant infections do not respond to most antibiotics.XDR Typhoid Fever in Pakistan397 XDR Typhoid Fever in Pakistan June 16, 2023 An outbreak of extensively drug-resistant (XDR) typhoid fever in Pakistan is ongoing. Extensively drug-resistant infections do not respond to most antibiotics. Read More >>
• Some travelers who have spent time in Mexico have been infected with multidrug-resistant (MDR) Salmonella Newport. Salmonella Newport in Mexico732 Salmonella Newport in Mexico March 29, 2023 Some travelers who have spent time in Mexico have been infected with multidrug-resistant (MDR) Salmonella Newport. Read More >>

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Brazil's central bank director Gabriel Galipolo said on Wednesday that the monetary authority should not get spooked with "short-term" market fluctuations and will need time to understand how recent moves affect its mandates.

Mexico's consumer prices unexpectedly rose in the first half of April, national statistics agency INEGI said on Wednesday, reinforcing bets that the country's central bank will hold its benchmark interest rate at its next policy meeting.

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Dubai’s Extraordinary Flooding: Here’s What to Know

Images of a saturated desert metropolis startled the world, prompting talk of cloud seeding, climate change and designing cities for intensified weather.

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By Raymond Zhong

Scenes of flood-ravaged neighborhoods in one of the planet’s driest regions have stunned the world this week. Heavy rains in the United Arab Emirates and Oman submerged cars, clogged highways and killed at least 21 people. Flights out of Dubai’s airport, a major global hub, were severely disrupted.

The downpours weren’t a freak event — forecasters anticipated the storms several days out and issued warnings. But they were certainly unusual. Here’s what to know.

Heavy rain there is rare, but not unheard-of.

On average, the Arabian Peninsula receives a scant few inches of rain a year, although scientists have found that a sizable chunk of that precipitation falls in infrequent but severe bursts, not as periodic showers.

U.A.E. officials said the 24-hour rain total on Tuesday was the country’s largest since records there began in 1949 . But parts of the nation had experienced an earlier round of thunderstorms just last month.

Oman, with its coastline on the Arabian Sea, is also vulnerable to tropical cyclones. Past storms there have brought torrential rain, powerful winds and mudslides, causing extensive damage.

Global warming is projected to intensify downpours.

Stronger storms are a key consequence of human-caused global warming. As the atmosphere gets hotter, it can hold more moisture, which can eventually make its way down to the earth as rain or snow.

But that doesn’t mean rainfall patterns are changing in precisely the same way across every corner of the globe.

In their latest assessment of climate research , scientists convened by the United Nations found there wasn’t enough data to have firm conclusions about rainfall trends in the Arabian Peninsula and how climate change was affecting them. The researchers said, however, that if global warming were to be allowed to continue worsening in the coming decades, extreme downpours in the region would quite likely become more intense and more frequent.

The role of cloud seeding isn’t clear.

The U.A.E. has for decades worked to increase rainfall and boost water supplies by seeding clouds. Essentially, this involves shooting particles into clouds to encourage the moisture to gather into larger, heavier droplets, ones that are more likely to fall as rain or snow.

Cloud seeding and other rain-enhancement methods have been tried across the world, including in Australia, China, India, Israel, South Africa and the United States. Studies have found that these operations can, at best, affect precipitation modestly — enough to turn a downpour into a bigger downpour, but probably not a drizzle into a deluge.

Still, experts said pinning down how much seeding might have contributed to this week’s storms would require detailed study.

“In general, it is quite a challenge to assess the impact of seeding,” said Luca Delle Monache, a climate scientist at the Scripps Institution of Oceanography in La Jolla, Calif. Dr. Delle Monache has been leading efforts to use artificial intelligence to improve the U.A.E.’s rain-enhancement program.

An official with the U.A.E.’s National Center of Meteorology, Omar Al Yazeedi, told news outlets this week that the agency didn’t conduct any seeding during the latest storms. His statements didn’t make clear, however, whether that was also true in the hours or days before.

Mr. Al Yazeedi didn’t respond to emailed questions from The New York Times on Thursday, and Adel Kamal, a spokesman for the center, didn’t immediately have further comment.

Cities in dry places just aren’t designed for floods.

Wherever it happens, flooding isn’t just a matter of how much rain comes down. It’s also about what happens to all that water once it’s on the ground — most critically, in the places people live.

Cities in arid regions often aren’t designed to drain very effectively. In these areas, paved surfaces block rain from seeping into the earth below, forcing it into drainage systems that can easily become overwhelmed.

One recent study of Sharjah , the capital of the third-largest emirate in the U.A.E., found that the city’s rapid growth over the past half century had made it vulnerable to flooding at far lower levels of rain than before.

Omnia Al Desoukie contributed reporting.

Raymond Zhong reports on climate and environmental issues for The Times. More about Raymond Zhong

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Athens swallowed up by orange haze from Sahara dust storm

Authorities in Greece warn the dust concentrations can reduce sunlight and visibility, while increasing levels of fine pollution particles pose health risks

Clouds of dust blown in from the Sahara covered Athens and other Greek cities on Tuesday, one of the worst such episodes to hit the country since 2018, officials said.

A yellow-orange haze smothered several regions after days of strong winds from the south, limiting visibility and prompting warnings from the authorities of breathing risks.

“It’s one of the most serious episodes of dust and sand concentrations from the Sahara since March 21-22, 2018, when the clouds invaded the island of Crete in particular,” said Kostas Lagouvardos, weather research director at the Athens Observatory.

Greece had already been struck by Sahara dust clouds in late March and early April which also smothered parts of Switzerland and southern France.

Authorities warned that the dust concentrations can reduce sunlight and visibility while increasing concentrations of fine pollution particles, posing risks for people with underlying health problems.

The Sahara releases 60 to 200m tonnes of mineral dust a year. While the largest particles come rapidly back down to earth, the smallest can travel thousands of kilometres, potentially reaching all of Europe .

The Greek weather service said the skies would begin to clear on Wednesday.

The strong southerly winds over the past few days have also fanned unseasonal early wildfires in the country’s south.

The fire service said on Tuesday evening that a total of 25 wildfires broke out across the country in the past 24 hours. Three people were arrested on the Aegean Sea resort island of Paros on suspicion of accidentally starting a scrub blaze on Monday, it added. No significant damage or injuries were reported, and the fire was quickly contained.

Another blaze that broke out on Crete near a naval base was brought under control Tuesday.

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