Cehnnai observed a ** percent reduction in average annual PM2.5 levels between 2019 and 2024. In comparison, Delhi - the second most polluted city India - saw PM2.5 levels rise ** percent during this period.Â
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IQAir. (March 11, 2025). Changes in fine particulate matter (PM2.5) concentrations in India from 2019 to 2024, by select city [Graph]. In ÌÇÐÄÆƽâ°æ. Retrieved July 20, 2026, from /statistics/1464314/india-pm25-concentration-change-by-city/
IQAir. "Changes in fine particulate matter (PM2.5) concentrations in India from 2019 to 2024, by select city." Chart. March 11, 2025. ÌÇÐÄÆƽâ°æ. Accessed July 20, 2026. /statistics/1464314/india-pm25-concentration-change-by-city/
IQAir. (2025). Changes in fine particulate matter (PM2.5) concentrations in India from 2019 to 2024, by select city. ÌÇÐÄÆƽâ°æ. ÌÇÐÄÆƽâ°æ Inc.. Accessed: July 20, 2026. /statistics/1464314/india-pm25-concentration-change-by-city/
IQAir. "Changes in Fine Particulate Matter (Pm2.5) Concentrations in India from 2019 to 2024, by Select City." ÌÇÐÄÆƽâ°æ, ÌÇÐÄÆƽâ°æ Inc., 11 Mar 2025, /statistics/1464314/india-pm25-concentration-change-by-city/
IQAir, Changes in fine particulate matter (PM2.5) concentrations in India from 2019 to 2024, by select city ÌÇÐÄÆƽâ°æ, /statistics/1464314/india-pm25-concentration-change-by-city/ (last visited July 20, 2026)
Changes in fine particulate matter (PM2.5) concentrations in India from 2019 to 2024, by select city [Graph], IQAir, March 11, 2025. [Online]. Available: /statistics/1464314/india-pm25-concentration-change-by-city/
