SmogRank / World / Thailand / Bangkok / January 2026
Most polluted cities in Bangkok, Thailand, January 2026
14 cities in Bangkok, Thailand ranked by their average PM2.5 over the 31 days. Worst: Khlong Sam Wa at 45.2 µg/m³, #61 of 2,593 cities in the world. Cleanest: Bangkok at 34.5. 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 84%
- 2Khan Na Yao 68%
- 3Lat Krabang 68%
- 4Bueng Kum 61%
- 5Saphan Sung 61%
- 6Nong Khaem 58%
- 7Bang Kapi 55%
- 8Bang Na 52%
- 9Sai Mai 52%
- 10Lak Si 52%
- 11Ban Samae Dam 48%
- 12Nong Chok 43%
- 13Ban Khlong Prawet 32%
- 14Bangkok 32%
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 2026 · All cities in Thailand, January 2026 · Bangkok now
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SmogRank, most polluted cities in Bangkok, Thailand, PM2.5, January 2026, smogrank.com/th/region/bangkok/history/2026-01 (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.