SmogRank / World / Asia / India / West Bengal
Most polluted cities in West Bengal, India
6 measured cities, last 30 days; 6 above the WHO 24-hour guideline. Worst: Kolkata at 27.8 µg/m³, #134 in the world.
464 monitors 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; that isn't clean air, and they return when the data does.
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.
Cities coloured by their PM2.5 over the last 24 hours. Fires, smoke and ash: Oct 5, the newest UTC day mapped.
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
Estimated: cities without a monitor
West Bengal 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 |
|---|---|
| Howrah | ≈ 76 µg/m³ |
| Bhātpāra | ≈ 85 µg/m³ |
| Maheshtala | ≈ 76 µg/m³ |
| Shyamnagar | ≈ 85 µg/m³ |
| Rajpur Sonarpur | ≈ 76 µg/m³ |
| Pānihāti | ≈ 85 µg/m³ |
| Kāmārhāti | ≈ 85 µg/m³ |
| Kulti | ≈ 66 µg/m³ |
| Barddhamān | ≈ 87 µg/m³ |
| Bārāsat | ≈ 85 µg/m³ |
| Bāli | ≈ 85 µg/m³ |
| Naihāti | ≈ 85 µg/m³ |
| Uluberiya | ≈ 78 µg/m³ |
| Kharagpur | ≈ 66 µg/m³ |
| Chandannagar | ≈ 85 µg/m³ |
| Baharampur | ≈ 84 µg/m³ |
| Hugli | ≈ 85 µg/m³ |
| Rāiganj | ≈ 55 µg/m³ |
| Malda | ≈ 63 µg/m³ |
| Madhyamgram | ≈ 85 µg/m³ |
| Jāmuria | ≈ 85 µg/m³ |
| Jaigaon | ≈ 43 µg/m³ |
| Medinīpur | ≈ 66 µg/m³ |
| Bālurghāt | ≈ 79 µg/m³ |
| Shāntipur | ≈ 83 µg/m³ |
| Bārākpur | ≈ 85 µg/m³ |
| Krishnanagar | ≈ 81 µg/m³ |
| Basirhat City | ≈ 76 µg/m³ |
| Hābra | ≈ 76 µg/m³ |
| Kānchrāpāra | ≈ 85 µg/m³ |
| Bānkura | ≈ 73 µg/m³ |
| Khardah | ≈ 85 µg/m³ |
| Hālīsahar | ≈ 85 µg/m³ |
| Titāgarh | ≈ 85 µg/m³ |
| Dārjiling | ≈ 22 µg/m³ |
| Dam Dam | ≈ 85 µg/m³ |
| Puruliya | ≈ 88 µg/m³ |
| Bhadreswar | ≈ 85 µg/m³ |
| Rishra | ≈ 85 µg/m³ |
| Baidyabāti | ≈ 85 µg/m³ |
Bad-air episodes in West Bengal
- Eastern India, 28 September to 1 October 20264 days15 cities85 µg/m³peak, Dera Colliery Township
- Eastern India, 15 to 17 September 20263 days14 cities79 µg/m³peak, Belpahar
- North-eastern India and Bhutan, September 20264 to 9 September 2026, 6 days15 cities107 µg/m³peak, Bihār Sharīf
- North-eastern India, July 202611 to 14 July 2026, 4 days23 cities149 µg/m³peak, Arrah
- India and Pakistan, October 20258 to 25 October 2025, 18 days178 cities493 µg/m³peak, Jīnd
- Odisha, Bihar and West Bengal, India, August 202512 August 2025, 1 day11 cities83 µg/m³peak, Bhāgalpur
Times when many cities around here had PM2.5 at twice their usual or more on the same days.
Use this board
SmogRank, most polluted cities in West Bengal, India, PM2.5, last 30 days to 6 Oct 2026, 23:00 UTC, smogrank.com/in/region/west-bengal?w=30d.
You're welcome to reuse a single chart, image or figure with this citation and a link. Terms. Raw monitor readings in bulk are published by OpenAQ, under each provider's licence.
Updated 2026-10-06 23:07 UTC. Values are PM2.5 (fine particles), the median of each city's monitors, as the US AQI PM2.5 sub-index.