SmogRank / World / Asia / India / Tamil Nadu

Most polluted cities in Tamil Nadu, India

4 measured cities, this year; 4 above the WHO annual guideline. Worst: Gummidipundi at 66.3 µg/m³, #14 in the world.

The 457 monitors run by CPCB in India haven't reported for more than two days. Cities that rely on them are missing from the 24-hour board and may drop from the longer ones; they return when the data does.

← Gummidipundi 66.3 WHO annual guideline

The European Environment Agency's air quality index bands for PM2.5 (2024 revision); it has bands, not numbers, so values stay in µg/m³. Show values as: µg/m³ · US AQI · India AQI · China AQI · European AQI · UK DAQI · Canada AQHI+. About the scales

Estimated: cities without a monitor

Tamil Nadu cities we can't measure, with model estimates for the last 7 days. Listed by population, not ranked: estimates aren't precise enough to rank. Model estimates from the Copernicus Atmosphere Monitoring Service (CAMS), adjusted to measured cities nearby where there are any. Adjusted, a single day lands within ×1.5 of what a monitor would read about two times in three; unadjusted, it can be off by half or double. Treat them as a guide, not a measurement.

City	7-day estimate	Band
Kallakurichi	≈ 33 µg/m³	Moderate
Madurai	≈ 14 µg/m³	Fair
Tirunelveli	≈ 9 µg/m³	Fair
Tiruchirappalli	≈ 25 µg/m³	Moderate
Tiruppur	≈ 21 µg/m³	Moderate
Salem	≈ 27 µg/m³	Moderate
Erode	≈ 25 µg/m³	Moderate
Vellore	≈ 44 µg/m³	Moderate
Ambattur	≈ 43 µg/m³	Moderate
Thoothukudi	≈ 10 µg/m³	Fair
Avadi	≈ 43 µg/m³	Moderate
Dindigul	≈ 24 µg/m³	Moderate
Thanjavur	≈ 21 µg/m³	Moderate
Rānipet	≈ 44 µg/m³	Moderate
Tiruvottiyūr	≈ 39 µg/m³	Moderate
Sivakasi	≈ 11 µg/m³	Fair
Karur	≈ 22 µg/m³	Moderate
Pallāvaram	≈ 38 µg/m³	Moderate
Ooty	≈ 12 µg/m³	Fair
Hosūr	≈ 29 µg/m³	Moderate
Nāgercoil	≈ 8 µg/m³	Fair
Kanchipuram	≈ 43 µg/m³	Moderate
Kumarapalayam	≈ 28 µg/m³	Moderate
Kāraikkudi	≈ 12 µg/m³	Fair
Neyveli	≈ 35 µg/m³	Moderate
Tambaram	≈ 38 µg/m³	Moderate
Kumbakonam	≈ 24 µg/m³	Moderate
Tiruvannamalai	≈ 44 µg/m³	Moderate
Rajapalayam	≈ 11 µg/m³	Fair
Kurichchi	≈ 17 µg/m³	Moderate
Madhavaram	≈ 39 µg/m³	Moderate
Pudukkottai	≈ 14 µg/m³	Fair
Ambur	≈ 34 µg/m³	Moderate
Nagapattinam	≈ 26 µg/m³	Moderate
Villupuram	≈ 37 µg/m³	Moderate
Kuniyamuttūr	≈ 17 µg/m³	Moderate
Paramagudi	≈ 13 µg/m³	Fair
Tiruchengode	≈ 28 µg/m³	Moderate
Vaniyambadi	≈ 34 µg/m³	Moderate
Kovilpatti	≈ 11 µg/m³	Fair

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SmogRank, most polluted cities in Tamil Nadu, India, PM2.5, this year to 2 Oct 2026, 02:00 UTC, smogrank.com/in/region/tamil-nadu?w=year.

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Updated 2026-10-02 02:07 UTC. Values are PM2.5 (fine particles), the median of each city's monitors in µg/m³.