SmogRank / World / Thailand / Bangkok / December 2023
Most polluted cities in Bangkok, Thailand, December 2023
2 cities in Bangkok, Thailand ranked by their average PM2.5 over the 31 days. Worst: Nong Khaem at 37.9 µg/m³, #40 of 2,197 cities in the world. Cleanest: Bangkok at 32.9. A city needs measurements on 70% of the days to be ranked.
Bangkok has 13 cities ranked over the last 30 days, but only 2 here: most of its monitors have no readings for December 2023 in OpenAQ's archive, where ours come from, or too few to rank. Cities missing from this board weren't clean, just not measured.
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 52%
- 2Bangkok 43%
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, December 2023 · All cities in Thailand, December 2023 · Bangkok now
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SmogRank, most polluted cities in Bangkok, Thailand, PM2.5, December 2023, smogrank.com/th/region/bangkok/history/2023-12 (accessed 7 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.