SmogRank / World / Thailand / Bangkok / 2023
Most polluted cities in Bangkok, Thailand, 2023
2 cities in Bangkok, Thailand ranked by their average PM2.5 over the 365 days; 2 above the WHO annual guideline (5.0 µg/m³). Worst: Nong Khaem at 27.0 µg/m³, #43 of 1,302 cities in the world. Cleanest: Bangkok at 23.1. A city needs measurements on 70% of the days to be ranked.
OpenAQ's archive, where our readings come from, has almost none for 56 of these 365 days. Cities in the United States and Europe have them from the EPA's and the European Environment Agency's own records of the same monitors; elsewhere a city's average is over its other days. Why.
Bangkok has 13 cities ranked over the last 30 days, but only 2 here: most of its monitors have no readings for 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 20%
- 2Bangkok 14%
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, 2023 · All cities in Thailand, 2023 · Bangkok now
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SmogRank, most polluted cities in Bangkok, Thailand, PM2.5, 2023, smogrank.com/th/region/bangkok/history/2023 (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.