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.

KeralaKarnataka: 6 measured citiesPuducherryTamil Nadu: 2 measured citiesAndhra Pradesh: 8 measured cities#4 Gudalur: 18.8 µg/m³#3 Chennai: 26.7 µg/m³#2 Neelankarai: 28.8 µg/m³#1 Gummidipundi: 66.3 µg/m³
Each dot is a measured city, coloured by its PM2.5; tap a dot to open the city.
← Gummidipundi 66.3 WHO annual guideline
Every measured city in Tamil Nadu, India, one column each, worst on the left and cleanest on the right. Point at it to read a city; tap to open it.
  1. 1Gummidipundi 9013.3×
  2. 2Neelankarai 425.8×
  3. 3Chennai 395.3×
  4. 4Gudalur 273.8×
Excellent0–50
Good51–100
Lightly polluted101–150
Moderately polluted151–200
Heavily polluted201–300
Severely polluted301+

China's Air Quality Index (HJ 633-2012), PM2.5 individual index. 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.

City7-day estimateBand
Kallakurichi≈ 33 µg/m³Excellent
Madurai≈ 14 µg/m³Excellent
Tirunelveli≈ 9 µg/m³Excellent
Tiruchirappalli≈ 25 µg/m³Excellent
Tiruppur≈ 21 µg/m³Excellent
Salem≈ 27 µg/m³Excellent
Erode≈ 25 µg/m³Excellent
Vellore≈ 44 µg/m³Good
Ambattur≈ 43 µg/m³Good
Thoothukudi≈ 10 µg/m³Excellent
Avadi≈ 43 µg/m³Good
Dindigul≈ 24 µg/m³Excellent
Thanjavur≈ 21 µg/m³Excellent
Rānipet≈ 44 µg/m³Good
Tiruvottiyūr≈ 39 µg/m³Good
Sivakasi≈ 11 µg/m³Excellent
Karur≈ 22 µg/m³Excellent
Pallāvaram≈ 38 µg/m³Good
Ooty≈ 12 µg/m³Excellent
Hosūr≈ 29 µg/m³Excellent
Nāgercoil≈ 8 µg/m³Excellent
Kanchipuram≈ 43 µg/m³Good
Kumarapalayam≈ 28 µg/m³Excellent
Kāraikkudi≈ 12 µg/m³Excellent
Neyveli≈ 35 µg/m³Excellent
Tambaram≈ 38 µg/m³Good
Kumbakonam≈ 24 µg/m³Excellent
Tiruvannamalai≈ 44 µg/m³Good
Rajapalayam≈ 11 µg/m³Excellent
Kurichchi≈ 17 µg/m³Excellent
Madhavaram≈ 39 µg/m³Good
Pudukkottai≈ 14 µg/m³Excellent
Ambur≈ 34 µg/m³Excellent
Nagapattinam≈ 26 µg/m³Excellent
Villupuram≈ 37 µg/m³Good
Kuniyamuttūr≈ 17 µg/m³Excellent
Paramagudi≈ 13 µg/m³Excellent
Tiruchengode≈ 28 µg/m³Excellent
Vaniyambadi≈ 34 µg/m³Excellent
Kovilpatti≈ 11 µg/m³Excellent

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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, as the China AQI PM2.5 sub-index.