SmogRank / World / India / West Bengal / April 2024
Most people breathing unhealthy air in West Bengal, India, April 2024
1 city in West Bengal, India measured at 2 or more places, ranked by how many people breathed unhealthy air on an average day over the 30 days. The most people breathing unhealthy air: Kolkata, India, about 4.63M on an average day. A city needs measurements on 70% of the days to be ranked.
About 4.63M people in this city breathed unhealthy air on an average day of April 2024.
Ranked by people: each city's population times its share of unhealthy days, those with a daily mean over 35.4 µg/m³ (US AQI 101+). That is how many people living there breathed unhealthy air on an average day. Only cities measured at 2 or more places at least 3 km apart are ranked: one monitor shouldn't speak for a whole city. Population is the city itself, not its wider metro area.
- 1Kolkata 4.63M
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, by people breathing unhealthy air, PM2.5, April 2024, smogrank.com/in/region/west-bengal/history/2024-04?by=people (accessed 7 Oct 2026).
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