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, #71 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

Canada's AQHI+ for PM2.5 (1 point per 10 µg/m³), which is defined on hourly values. 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 risk
Madurai	≈ 14 µg/m³	Low risk
Tirunelveli	≈ 9 µg/m³	Low risk
Tiruchirappalli	≈ 25 µg/m³	Low risk
Tiruppur	≈ 21 µg/m³	Low risk
Salem	≈ 27 µg/m³	Low risk
Erode	≈ 25 µg/m³	Low risk
Vellore	≈ 44 µg/m³	Moderate risk
Ambattur	≈ 43 µg/m³	Moderate risk
Thoothukudi	≈ 10 µg/m³	Low risk
Avadi	≈ 43 µg/m³	Moderate risk
Dindigul	≈ 24 µg/m³	Low risk
Thanjavur	≈ 21 µg/m³	Low risk
Rānipet	≈ 44 µg/m³	Moderate risk
Tiruvottiyūr	≈ 39 µg/m³	Moderate risk
Sivakasi	≈ 11 µg/m³	Low risk
Karur	≈ 22 µg/m³	Low risk
Pallāvaram	≈ 38 µg/m³	Moderate risk
Ooty	≈ 12 µg/m³	Low risk
Hosūr	≈ 29 µg/m³	Low risk
Nāgercoil	≈ 8 µg/m³	Low risk
Kanchipuram	≈ 43 µg/m³	Moderate risk
Kumarapalayam	≈ 28 µg/m³	Low risk
Kāraikkudi	≈ 12 µg/m³	Low risk
Neyveli	≈ 35 µg/m³	Moderate risk
Tambaram	≈ 38 µg/m³	Moderate risk
Kumbakonam	≈ 24 µg/m³	Low risk
Tiruvannamalai	≈ 44 µg/m³	Moderate risk
Rajapalayam	≈ 11 µg/m³	Low risk
Kurichchi	≈ 17 µg/m³	Low risk
Madhavaram	≈ 39 µg/m³	Moderate risk
Pudukkottai	≈ 14 µg/m³	Low risk
Ambur	≈ 34 µg/m³	Moderate risk
Nagapattinam	≈ 26 µg/m³	Low risk
Villupuram	≈ 37 µg/m³	Moderate risk
Kuniyamuttūr	≈ 17 µg/m³	Low risk
Paramagudi	≈ 13 µg/m³	Low risk
Tiruchengode	≈ 28 µg/m³	Low risk
Vaniyambadi	≈ 34 µg/m³	Moderate risk
Kovilpatti	≈ 11 µg/m³	Low risk

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SmogRank, most polluted cities in Tamil Nadu, India, PM2.5, this year to 2 Oct 2026, 04:00 UTC, smogrank.com/in/region/tamil-nadu?w=year.

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Updated 2026-10-02 04:07 UTC. Values are PM2.5 (fine particles), the median of each city's monitors, as the Canada AQHI+ PM2.5 sub-index.