SmogRank / World / India / Tamil Nadu / July 2025
Most polluted cities in Tamil Nadu, India, July 2025
17 cities in Tamil Nadu, India ranked by their average PM2.5 over the 31 days. Worst: Cuddalore at 55.0 µg/m³, #24 of 2,832 cities in the world. Cleanest: Tambaram at 13.4. 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 52%
- 3Ramanathapuram 52%
- 4Nilaiyūr 30%
- 5Ariyalūr 26%
- 6Tiruppur 22%
- 7Vellore 15%
- 8Navalpattu 8%
- 9Tiruchirappalli 7%
- 10Neelankarai 4%
- 11Dindigul 4%
- 12Tambaram 3%
- 13Chennai 0%
- 14Coimbatore 0%
- 15Naduvattam 0%
- 16Perundurai 0%
- 17Tirunelveli 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, July 2025, smogrank.com/in/region/tamil-nadu/history/2025-07 (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.