SmogRank / World / India / Tamil Nadu / August 2025
Most polluted cities in Tamil Nadu, India, August 2025
22 cities in Tamil Nadu, India ranked by their average PM2.5 over the 31 days. Worst: Nagapattinam at 72.0 µg/m³, #2 of 2,841 cities in the world. Cleanest: Dindigul at 13.6. 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 93%
- 2Rānipet 64%
- 3Cuddalore 59%
- 4Nagapattinam 59%
- 5Ramanathapuram 53%
- 6Nilaiyūr 28%
- 7Tiruppur 27%
- 8Kanchipuram 24%
- 9Gūduvāncheri 22%
- 10Tiruchirappalli 20%
- 11Neelankarai 20%
- 12Ooty 17%
- 13Navalpattu 4%
- 14Vellore 4%
- 15Chennai 0%
- 16Salem 0%
- 17Naduvattam 0%
- 18Ariyalūr 0%
- 19Perundurai 0%
- 20Coimbatore 0%
- 21Tirunelveli 0%
- 22Dindigul 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
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SmogRank, most polluted cities in Tamil Nadu, India, PM2.5, August 2025, smogrank.com/in/region/tamil-nadu/history/2025-08 (accessed 6 Oct 2026).
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