SmogRank / World / India / Tamil Nadu / March 2025

Most polluted cities in Tamil Nadu, India, March 2025

19 cities in Tamil Nadu, India ranked by their average PM2.5 over the 31 days. Worst: Tiruchirappalli at 55.3 µg/m³, #62 of 2,809 cities in the world. Cleanest: Tirunelveli at 14.9. 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.

← Gummidipundi 70% 60%0

Every city in Tamil Nadu, India ranked for March 2025, 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.

1Gummidipundi
70%
2Tiruchirappalli
59%
3Tiruppur
52%
4Coimbatore
52%
5Vellore
46%
6Ramanathapuram
43%
7Dindigul
41%
8Thanjavur
39%
9Salem
39%
10Cuddalore
36%
11Ariyalūr
36%
12Nilaiyūr
30%
13Neelankarai
29%
14Tambaram
28%
15Navalpattu
24%
16Karur
18%
17Chennai
13%
18Perundurai
0%
19Tirunelveli
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

All cities in the world, March 2025 · All cities in India, March 2025 · Tamil Nadu now

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SmogRank, most polluted cities in Tamil Nadu, India, PM2.5, March 2025, smogrank.com/in/region/tamil-nadu/history/2025-03 (accessed 7 Oct 2026).

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