Only Seven Countries Met WHO Air Quality Standards in 2024, Data Shows 

A general view shows the Signature Bridge over the Yamuna River on a smoggy winter morning in New Delhi on December 20, 2024. (AFP)
A general view shows the Signature Bridge over the Yamuna River on a smoggy winter morning in New Delhi on December 20, 2024. (AFP)
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Only Seven Countries Met WHO Air Quality Standards in 2024, Data Shows 

A general view shows the Signature Bridge over the Yamuna River on a smoggy winter morning in New Delhi on December 20, 2024. (AFP)
A general view shows the Signature Bridge over the Yamuna River on a smoggy winter morning in New Delhi on December 20, 2024. (AFP)

Only seven countries met World Health Organization (WHO) air quality standards last year, data showed on Tuesday, as researchers warned that the war on smog would only get harder after the United States shut down its global monitoring efforts.

Chad and Bangladesh were the world's most polluted countries in 2024, with average smog levels more than 15 times higher than WHO guidelines, according to figures compiled by Swiss air quality monitoring firm IQAir.

Only Australia, New Zealand, the Bahamas, Barbados, Grenada, Estonia and Iceland made the grade, IQAir said.

Significant data gaps, especially in Asia and Africa, cloud the worldwide picture, and many developing countries have relied on air quality sensors mounted on US embassy and consulate buildings to track their smog levels.

However, the State Department has recently ended the scheme, citing budget constraints, with more than 17 years of data removed last week from the US government's official air quality monitoring site, airnow.gov, including readings collected in Chad.

"Most countries have a few other data sources, but it's going to impact Africa significantly, because oftentimes these are the only sources of publicly available real-time air quality monitoring data," said Christi Chester-Schroeder, IQAir's air quality science manager.

Data concerns meant Chad was excluded from IQAir's 2023 list, but it was also ranked the most polluted country in 2022, plagued by Sahara dust as well as uncontrolled crop burning.

Average concentrations of small, hazardous airborne particles known as PM2.5 hit 91.8 micrograms per cubic meter (mg/cu m) last year in the country, slightly higher than 2022.

The WHO recommends levels of no more than 5 mg/cu m, a standard met by only 17% of cities last year.

India, fifth in the smog rankings behind Chad, Bangladesh, Pakistan and the Democratic Republic of Congo, saw average PM2.5 fall 7% on the year to 50.6 mg/cu m.

But it accounted for 12 of the top 20 most polluted cities, with Byrnihat, in a heavily industrialized part of the country's northeast, in first place, registering an average PM2.5 level of 128 mg/cu m.

Climate change is playing an increasing role in driving up pollution, Chester-Schroeder warned, with higher temperatures causing fiercer and lengthier forest fires that swept through parts of South East Asia and South America.

Christa Hasenkopf, director of the Clean Air Program at the University of Chicago's Energy Policy Institute (EPIC), said at least 34 countries will lose access to reliable pollution data after the US program was closed.

The State Department scheme improved air quality in the cities where the monitors were placed, boosting life expectancy and even reducing hazard allowances for US diplomats, meaning that it paid for itself, Hasenkopf said.

"(It) is a giant blow to air quality efforts worldwide," she said.



Firefighters Battle a Wildfire Burning Out of Control on the Greek Island of Chios

A firefighting helicopter during firefighting operations on Chios Island, Greece, 24 June 2025. EPA/KOSTAS KOURGIAS
A firefighting helicopter during firefighting operations on Chios Island, Greece, 24 June 2025. EPA/KOSTAS KOURGIAS
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Firefighters Battle a Wildfire Burning Out of Control on the Greek Island of Chios

A firefighting helicopter during firefighting operations on Chios Island, Greece, 24 June 2025. EPA/KOSTAS KOURGIAS
A firefighting helicopter during firefighting operations on Chios Island, Greece, 24 June 2025. EPA/KOSTAS KOURGIAS

Hundreds of firefighters backed up by aircraft were battling a wildfire burning out of control for the third day on the eastern Aegean island of Chios Tuesday, with authorities issuing multiple evacuation orders.

Towering walls of flames tore through forest and agricultural land on the island, where authorities have declared a state of emergency and have sent firefighting reinforcements from Athens, the northern city of Thessaloniki and the nearby island of Lesbos, said the Associated Press.

By Tuesday morning, the fire department said 444 firefighters with 85 vehicles were tackling the blaze on scattered fronts. Eleven helicopters and two water-dropping planes were providing air support.

Emergency services have issued evacuation orders for villages and settlements in the area since Sunday, when fires broke out near the island’s main town. The fire department has sent an arson investigation team to Chios to examine the cause of the blaze.

“We are faced with simultaneous fires in multiple, geographically unconnected parts of the island — a pattern that cannot be considered coincidental,” Climate Crisis and Civil Protection Minister Giannis Kefalogiannis said Monday from Chios. Authorities, he said, were “very seriously examining the possibility of an organized criminal act, in other words arson.”

The minister said police forces on the island had been reinforced, while military patrols had been doubled.

“Whoever thinks that they can play with the lives of citizens and cause chaos with premeditated actions will be led to court,” Kefalogiannis said. “Arson is a serious crime and will be dealt with as such.”

Wildfires are frequent in Greece during its hot, dry summers. In 2018, a massive fire swept through the seaside town of Mati, east of Athens, trapping people in their homes and on roads as they tried to flee. More than 100 died, including some who drowned trying to swim away from the flames.