According to new data from Swiss firm IQAir, in a stark revelation, only seven countries met WHO air quality standards in 2024, highlighting a global pollution crisis intensified by climate change and data shortages.

Released on March 11, 2025, the report underscores that only seven countries met WHO air quality standards in 2024, with nations like Chad and Bangladesh topping the list of the most polluted, while the U.S. discontinuation of its global monitoring program has left gaping holes in tracking efforts, particularly in Asia and Africa.

The Elite Seven and the Pollution Leaders

Only Australia, New Zealand, the Bahamas, Barbados, Grenada, Estonia, and Iceland achieved the WHO’s PM2.5 guideline of 5 micrograms per cubic meter (mg/cu m), showcasing exceptional air quality amid a global struggle.

Chad is the most polluted country with an average PM2.5 of 91.8 mg/cu m—over 18 times the WHO limit—driven by Sahara dust and crop burning, followed by Bangladesh at levels exceeding 15 times the guideline.

Ranking fifth globally, India reduced its PM2.5 by 7% to 50.6 mg/cu m, yet hosts 12 of the top 20 most polluted cities, with Byrnihat in the northeast hitting 128 mg/cu m.

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U.S. Monitoring Shutdown Amplifies Data Gaps

The U.S. State Department terminated its global air quality monitoring scheme in 2025 due to budget cuts, erasing over 17 years of data from airnow.gov, which was previously vital for developing nations.

Significant data gaps persist, especially in Africa, where U.S. embassy sensors were often the sole real-time pollution trackers, affecting at least 34.

Hasenkopf noted that the scheme had improved local air quality, increased life expectancy, and cut U.S. diplomats’ hazard pay, making its closure a “giant blow” to worldwide efforts.

Climate Change Fuels Rising Pollution

Climate change exacerbates air quality, with rising temperatures sparking fiercer forest fires in Southeast Asia and South America, as warned by IQAir’s Christi Chester-Schroeder.

Only 17% of cities met the WHO’s 5 mg/cu m PM2.5 standard in 2024, reflecting widespread exposure to hazardous particles linked to health issues like heart disease and lung cancer.

The report, dated March 10, 2025, calls for enhanced monitoring and action as pollution—responsible for 8.1 million deaths in 2021 per the State of Global Air—remains a pressing public health emergency.

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