SmogRank / World / Thailand / Bangkok / December 2025
Most polluted cities in Bangkok, Thailand, December 2025
14 cities in Bangkok, Thailand ranked by their average PM2.5 over the 31 days. Worst: Khlong Sam Wa at 34.5 µg/m³, #268 of 2,960 cities in the world. Cleanest: Ban Khlong Prawet at 25.1. 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 35%
- 2Khlong Sam Wa 32%
- 3Khan Na Yao 32%
- 4Ban Samae Dam 26%
- 5Bang Na 19%
- 6Lat Krabang 19%
- 7Bangkok 19%
- 7Bueng Kum 19%
- 9Lak Si 19%
- 10Bang Kapi 19%
- 11Saphan Sung 16%
- 12Sai Mai 16%
- 13Nong Chok 16%
- 14Ban Khlong Prawet 16%
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, December 2025, smogrank.com/th/region/bangkok/history/2025-12 (accessed 7 Oct 2026).
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