SmogRank / World / Thailand / Bangkok / 2026
Most polluted cities in Bangkok, Thailand, 2026
14 cities in Bangkok, Thailand ranked by their average PM2.5 so far (278 of 365 days); 14 above the WHO annual guideline (5.0 µg/m³). Worst: Bang Na at 25.5 µg/m³, #253 of 2,745 cities in the world. Cleanest: Ban Khlong Prawet at 19.0. 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.
- 1Khlong Sam Wa 18%
- 2Khan Na Yao 16%
- 3Lat Krabang 15%
- 4Bang Na 14%
- 5Nong Khaem 14%
- 6Bueng Kum 12%
- 7Saphan Sung 12%
- 8Lak Si 10%
- 9Bang Kapi 10%
- 10Ban Samae Dam 10%
- 11Sai Mai 10%
- 12Nong Chok 9%
- 13Bangkok 8%
- 14Ban Khlong Prawet 6%
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, 2026 (so far), smogrank.com/th/region/bangkok/history/2026 (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.