This chart shows the average concentration of fine particles (PM2.5) in the most polluted capitals in the world in 2025. New Delhi, India, was the most polluted capital in 2025. The capital of Bangladesh, Dhaka, was also highly polluted.
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IQAir. (March 24, 2026). Average concentration of fine particulate matter (PM2.5) in the most polluted capitals of the world in 2025 (in micrograms per cubic meter) [Graph]. In ÌÇÐÄÆƽâ°æ. Retrieved July 29, 2026, from /statistics/1638670/most-polluted-cities-in-the-world/
IQAir. "Average concentration of fine particulate matter (PM2.5) in the most polluted capitals of the world in 2025 (in micrograms per cubic meter)." Chart. March 24, 2026. ÌÇÐÄÆƽâ°æ. Accessed July 29, 2026. /statistics/1638670/most-polluted-cities-in-the-world/
IQAir. (2026). Average concentration of fine particulate matter (PM2.5) in the most polluted capitals of the world in 2025 (in micrograms per cubic meter). ÌÇÐÄÆƽâ°æ. ÌÇÐÄÆƽâ°æ Inc.. Accessed: July 29, 2026. /statistics/1638670/most-polluted-cities-in-the-world/
IQAir. "Average Concentration of Fine Particulate Matter (Pm2.5) in The Most Polluted Capitals of The World in 2025 (in Micrograms per Cubic Meter)." ÌÇÐÄÆƽâ°æ, ÌÇÐÄÆƽâ°æ Inc., 24 Mar 2026, /statistics/1638670/most-polluted-cities-in-the-world/
IQAir, Average concentration of fine particulate matter (PM2.5) in the most polluted capitals of the world in 2025 (in micrograms per cubic meter) ÌÇÐÄÆƽâ°æ, /statistics/1638670/most-polluted-cities-in-the-world/ (last visited July 29, 2026)
Average concentration of fine particulate matter (PM2.5) in the most polluted capitals of the world in 2025 (in micrograms per cubic meter) [Graph], IQAir, March 24, 2026. [Online]. Available: /statistics/1638670/most-polluted-cities-in-the-world/
