SmogRank / World / Thailand / Bangkok / March 2026
Most polluted cities in Bangkok, Thailand, March 2026
14 cities in Bangkok, Thailand ranked by their average PM2.5 over the 31 days. Worst: Bang Na at 29.8 µg/m³, #285 of 2,947 cities in the world. Cleanest: Ban Khlong Prawet at 22.8. A city needs measurements on 70% of the days to be ranked.
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.
- 1Nong Khaem 19%
- 2Bang Na 13%
- 3Khan Na Yao 13%
- 4Khlong Sam Wa 13%
- 5Ban Samae Dam 13%
- 6Lat Krabang 10%
- 7Nong Chok 10%
- 8Saphan Sung 7%
- 9Sai Mai 6%
- 10Bueng Kum 6%
- 11Lak Si 6%
- 12Bang Kapi 3%
- 13Bangkok 3%
- 14Ban Khlong Prawet 3%
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 2026 · All cities in Thailand, March 2026 · Bangkok now
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SmogRank, most polluted cities in Bangkok, Thailand, PM2.5, March 2026, smogrank.com/th/region/bangkok/history/2026-03 (accessed 6 Oct 2026).
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