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Data shows that only seven countries will meet WHO standards for air quality in 2024.

Data showed that only seven countries met the World Health Organization's (WHO) standards for air quality last year. Researchers warned, however, that the fight against smog will become even more difficult after the United States stops its global monitoring.

According to data compiled by Swiss air monitoring firm IQAir, Chad and Bangladesh had the highest average smog levels in 2024. These levels were more than 15-times higher than WHO guidelines.

IQAir stated that only Australia, New Zealand and the Bahamas made the cut, as did Barbados, Grenada Grenada, Estonia, and Iceland.

There are significant data gaps in Asia and Africa that cloud the global picture. Many developing countries rely on air quality sensors installed on U.S. Embassy and Consulate buildings to track smog levels.

The State Department, citing financial constraints, has ended the program. Last week, more than 17-years of data were removed from airnow.gov, the official U.S. Government air quality monitoring website, including readings taken in Chad.

Christi Chester-Schroeder is IQAir’s air quality scientist. She said that most countries have other data sources. However, these data are often the only ones available to the public.

Data concerns prevented the Chad from being included in IQAir's list for 2023. However, it was ranked as the most polluted nation in 2022 due to Sahara dust and uncontrolled crop burns.

The average concentration of dangerous airborne particles, known as PM2.5, was 91.8 micrograms/cubic metre (mg/cu/m2) in the United States last year, a little higher than 2022.

Only 17% of cities met the WHO standard of 5 mg/cu.m.

India, which is ranked fifth in smog rankings, behind Chad (the top smog country), Bangladesh, Pakistan, and the Democratic Republic of Congo saw the average PM2.5 drop 7% over the past year to 50.6mg/cu m.

Byrnihat in the heavily industrialised northeast of the country, was the first city to register a PM2.5 average of 128mg/cu m.

Chester-Schroeder warns that climate change plays a greater role in pollution. Higher temperatures have caused more intense and longer forest fires to rage through South East Asia and South America.

Christa Hasenkopf of the Clean Air Program of the University of Chicago Energy Policy Institute (EPIC) said that after the U.S. program is closed, at least 34 other countries will no longer have access to reliable data on pollution.

Hasenkopf stated that the State Department program improved air quality and increased life expectancy in cities where monitors were installed. It also reduced hazard allowances to U.S. diplomatic staff, meaning it paid for itself.

She said, "It is a huge blow to efforts around the world to improve air quality." (Reporting and editing by David Stanway)

(source: Reuters)