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Air Quality in Chennai
December 25 , 2025
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- Chennai recorded lower PM2.5 (fine particulate matter) levels compared to many Indian cities.
- Kodungaiyur station recorded 12.6 µg/m³, below the national standard of 40 µg/m³.
- It recorded the lowest annual average PM2.5 level in the country in 2024.
- Several areas in Chennai reported PM2.5 levels below 20 µg/m³.
- PM10 (coarse dust particles) pollution remains a major challenge in the city.
- Velachery recorded 47 µg/m³ of PM10, within the national limit of 60 µg/m³.
- Coastal factors like sea breeze helped reduce PM2.5 levels in Chennai.
- PM10 denote the coarser particles largely linked to road dust, construction activity and soil re-suspension.
- The Delhi-NCR region continues to dominate the list of the most polluted locations for both PM10 and PM2.5, with annual PM10 levels crossing 250 µg/m³ at multiple stations.
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