SmogRank / World / India / Tamil Nadu / April 2026

Most polluted cities in Tamil Nadu, India, April 2026

5 cities in Tamil Nadu, India ranked by their average PM2.5 over the 30 days. Worst: Gummidipundi at 48.4 µg/m³, #80 of 2,914 cities in the world. Cleanest: Chennai at 15.7. 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.

← Gummidipundi 93% 90%0
Every city in Tamil Nadu, India ranked for April 2026, one column each, ranked by unhealthy days: height is the share of its measured days that were unhealthy, colour its average. Point at it to read a city; tap to open it.
  1. 1Gummidipundi
    93%
  2. 2Coimbatore
    12%
  3. 3Neelankarai
    7%
  4. 4Naduvattam
    0%
  5. 5Chennai
    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, April 2026, smogrank.com/in/region/tamil-nadu/history/2026-04 (accessed 6 Oct 2026).

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