SmogRank / World / India / West Bengal / 2024
Most polluted cities in West Bengal, India, 2024
1 city in West Bengal, India ranked by their average PM2.5 over the 366 days; 1 above the WHO annual guideline (5.0 µg/m³). The only one: Kolkata at 72.4 µg/m³, #6 of 2,052 cities in the world. A city needs measurements on 70% of the days to be ranked.
OpenAQ's archive, where our readings come from, has almost none for one of these days. Cities in the United States and Europe have it from the EPA's and the European Environment Agency's own records of the same monitors; elsewhere a city's average is over its other days. Why.
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.
- 1Kolkata 59%
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
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SmogRank, most polluted cities in West Bengal, India, PM2.5, 2024, smogrank.com/in/region/west-bengal/history/2024 (accessed 6 Oct 2026).
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.