SmogRank / World / India / Tamil Nadu / September 2025
Most polluted cities in Tamil Nadu, India, September 2025
19 cities in Tamil Nadu, India ranked by their average PM2.5 over the 30 days. Worst: Gummidipundi at 79.2 µg/m³, #1 of 3,052 cities in the world. Cleanest: Tambaram at 10.0. 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.
- 1Gummidipundi 100%
- 2Cuddalore 61%
- 3Ramanathapuram 56%
- 4Ariyalūr 29%
- 5Tiruppur 25%
- 6Gūduvāncheri 19%
- 7Nilaiyūr 19%
- 8Tiruchirappalli 15%
- 9Karur 7%
- 10Neelankarai 7%
- 11Salem 5%
- 12Chennai 3%
- 13Coimbatore 0%
- 14Naduvattam 0%
- 15Navalpattu 0%
- 16Perundurai 0%
- 17Dindigul 0%
- 18Tirunelveli 0%
- 19Tambaram 0%
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, September 2025 · All cities in India, September 2025 · Tamil Nadu now
Use this board
SmogRank, most polluted cities in Tamil Nadu, India, PM2.5, September 2025, smogrank.com/in/region/tamil-nadu/history/2025-09 (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.