Tajikistan ranked as the world’s third most polluted country in 2025, according to the latest World Air Quality Report by IQAir.
The report analyzed PM2.5 concentrations across 9,446 cities in 143 countries and territories. PM2.5, fine particulate matter measured in micrograms per cubic meter, is widely used as a key indicator of air pollution.
The five most polluted countries in 2025 were Pakistan (67.3 µg/m³), Bangladesh (66.1 µg/m³), Tajikistan (57.3 µg/m³), Chad (53.6 µg/m³), and the Democratic Republic of the Congo (50.2 µg/m³).
Only 13 countries and territories met the World Health Organization annual PM2.5 guideline of 5 µg/m³, including Australia, Iceland, and Estonia. Overall, 130 out of 143 countries exceeded the guideline.
Kazakhstan records the cleanest air in Central Asia, but still had the 29th worst air globally in 2025, a very significant decline from 71st in 2024. Uzbekistan has the region’s dirtiest air, and the 10th worst worldwide, while Kyrgyzstan is only slightly better, in 19th. Like Kazakhstan, both countries have fallen down the rankings since they were last put together in 2024. Kyrgyzstan had been in 41st place, while Uzbekistan has fallen from 19th.
Turkmenistan, which was also among the 30 most polluted countries in 2024, was not included in the 2025 report due to a lack of available data.
Karaganda in Kazakhstan is Central Asia’s most polluted city, ranking 26th globally in 2025. The city recorded an annual PM2.5 level of 72.6 µg/m³, more than ten times the WHO guideline.
Other heavily polluted cities in the region included Fergana (30th, 68.8 µg/m³), Dushanbe (51st, 57.3 µg/m³), Guliston (100th), and Tashkent (225th, 39 µg/m³).
The report also noted that the world’s 25 most polluted cities in 2025 were all located in India, Pakistan, and China, with India accounting for three of the top four.
