SmogRank / World / India / Tamil Nadu / February 2025
Most polluted cities in Tamil Nadu, India, February 2025
1 city in Tamil Nadu, India ranked by their average PM2.5 over the 28 days. The only one: Chennai at 40.9 µg/m³, #91 of 2,574 cities in the world. A city needs measurements on 70% of the days to be ranked.
Ranked by unhealthy days: the share of each city's measured days with a daily mean over 35.4 µg/m³ (US AQI 101+), Unhealthy for Sensitive Groups or worse on the US EPA's scale. Ties go to the higher average.
- 1Chennai 57%
The US EPA's Air Quality Index for PM2.5 (2024 breakpoints). Show values as: µg/m³ · US AQI · India AQI · China AQI · European AQI · UK DAQI · Canada AQHI+. About the scales
All cities in the world, February 2025 · All cities in India, February 2025 · Tamil Nadu now
Use this board
SmogRank, most polluted cities in Tamil Nadu, India, PM2.5, February 2025, smogrank.com/in/region/tamil-nadu/history/2025-02 (accessed 6 Oct 2026).
You're welcome to reuse a single chart, image or figure with this citation and a link. Terms. Raw monitor readings in bulk are published by OpenAQ, under each provider's licence.