SmogRank / World / India / Tamil Nadu / September 2026

Most polluted cities in Tamil Nadu, India, September 2026

2 cities in Tamil Nadu, India ranked by their average PM2.5 over the 30 days. Worst: Chennai at 24.5 µg/m³, #187 of 2,949 cities in the world. Cleanest: Naduvattam at 17.9. 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.

  1. 1Chennai
    10%
  2. 2Naduvattam
    0%
Good0–50
Moderate51–100
Sensitive groups101–150
Unhealthy151–200
Very unhealthy201–300
Hazardous301+

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, September 2026, smogrank.com/in/region/tamil-nadu/history/2026-09 (accessed 6 Oct 2026).

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