SmogRank / World / Thailand / Bangkok / January 2025
Most polluted cities in Bangkok, Thailand, January 2025
14 cities in Bangkok, Thailand ranked by their average PM2.5 over the 31 days. Worst: Nong Khaem at 54.1 µg/m³, #27 of 2,426 cities in the world. Cleanest: Saphan Sung at 43.6. 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 87%
- 1Khlong Sam Wa 87%
- 3Lak Si 84%
- 4Bueng Kum 81%
- 5Khan Na Yao 81%
- 6Lat Krabang 81%
- 7Ban Samae Dam 81%
- 8Bang Kapi 77%
- 9Bang Na 74%
- 10Bangkok 74%
- 11Nong Chok 71%
- 12Saphan Sung 70%
- 13Sai Mai 68%
- 14Ban Khlong Prawet 65%
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, January 2025 · All cities in Thailand, January 2025 · Bangkok now
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SmogRank, most polluted cities in Bangkok, Thailand, PM2.5, January 2025, smogrank.com/th/region/bangkok/history/2025-01 (accessed 7 Oct 2026).
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