Loni in India was the most polluted city in the world in 2025, with average annual PM2.5 concentration of around 112.5 micrograms per cubic meter of air (μg/m³). This was roughly ** times above the WHO PM2.5 recommended guideline. 11 out of the ** most polluted cities in the world in 2025 were located in India, including New Delhi.
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IQAir. (March 24, 2026). Average PM2.5 concentration in the most polluted cities worldwide in 2025 (in micrograms per cubic meter of air) [Graph]. In ÌÇÐÄÆƽâ°æ. Retrieved July 23, 2026, from /statistics/1222702/most-polluted-cities-in-the-world/
IQAir. "Average PM2.5 concentration in the most polluted cities worldwide in 2025 (in micrograms per cubic meter of air)." Chart. March 24, 2026. ÌÇÐÄÆƽâ°æ. Accessed July 23, 2026. /statistics/1222702/most-polluted-cities-in-the-world/
IQAir. (2026). Average PM2.5 concentration in the most polluted cities worldwide in 2025 (in micrograms per cubic meter of air). ÌÇÐÄÆƽâ°æ. ÌÇÐÄÆƽâ°æ Inc.. Accessed: July 23, 2026. /statistics/1222702/most-polluted-cities-in-the-world/
IQAir. "Average Pm2.5 Concentration in The Most Polluted Cities Worldwide in 2025 (in Micrograms per Cubic Meter of Air)." ÌÇÐÄÆƽâ°æ, ÌÇÐÄÆƽâ°æ Inc., 24 Mar 2026, /statistics/1222702/most-polluted-cities-in-the-world/
IQAir, Average PM2.5 concentration in the most polluted cities worldwide in 2025 (in micrograms per cubic meter of air) ÌÇÐÄÆƽâ°æ, /statistics/1222702/most-polluted-cities-in-the-world/ (last visited July 23, 2026)
Average PM2.5 concentration in the most polluted cities worldwide in 2025 (in micrograms per cubic meter of air) [Graph], IQAir, March 24, 2026. [Online]. Available: /statistics/1222702/most-polluted-cities-in-the-world/
