SmogRank / World / Thailand / Bangkok / March 2025
Most people breathing unhealthy air in Bangkok, Thailand, March 2025
2 cities in Bangkok, Thailand measured at 2 or more places, ranked by how many people breathed unhealthy air on an average day over the 31 days. The most people breathing unhealthy air: Bangkok, Thailand, about 1.65M on an average day. A city needs measurements on 70% of the days to be ranked.
Bangkok has 13 cities ranked over the last 30 days, but only 3 here: most of its monitors have no readings for March 2025 in OpenAQ's archive, where ours come from, or too few to rank. Cities missing from this board weren't clean, just not measured.
About 1.71M people in these 2 cities breathed unhealthy air on an average day of March 2025.
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.
- 1Bangkok 1.65M
- 2Nong Khaem 65.1K
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 Thailand, March 2025 · Bangkok now
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SmogRank, most polluted cities in Bangkok, Thailand, by people breathing unhealthy air, PM2.5, March 2025, smogrank.com/th/region/bangkok/history/2025-03?by=people (accessed 7 Oct 2026).
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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.