SmogRank / World / Thailand / Bangkok / 2025
Most polluted cities in Bangkok, Thailand, 2025
1 city in Bangkok, Thailand ranked by their average PM2.5 over the 365 days; 1 above the WHO annual guideline (5.0 µg/m³). The only one: Bangkok at 24.8 µg/m³, #197 of 2,624 cities in the world. A city needs measurements on 70% of the days to be ranked.
Bangkok has 13 cities ranked over the last 30 days, but only 1 here: most of its monitors have no readings for 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 1.08M people in this city breathed unhealthy air on an average day of 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 1.08M
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 Bangkok, Thailand, PM2.5, 2025, smogrank.com/th/region/bangkok/history/2025 (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.