SmogRank / World / Thailand / Bangkok / September 2023

Most polluted cities in Bangkok, Thailand, September 2023

3 cities in Bangkok, Thailand ranked by their average PM2.5 over the 30 days. Worst: Nong Khaem at 16.5 µg/m³, #135 of 2,128 cities in the world. Cleanest: Bang Kapi at 11.5. A city needs measurements on 70% of the days to be ranked.

Bangkok has 13 cities ranked over the last 30 days, but only 3 here: most of its monitors have no readings for September 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.

← Nong Khaem 0% 0.75%0
Every city in Bangkok, Thailand ranked for September 2023, one column each, ranked by unhealthy days: height is the share of its measured days that were unhealthy, colour its average. Point at it to read a city; tap to open it.
  1. 1Nong Khaem
    0%
  2. 2Bangkok
    0%
  3. 3Bang Kapi
    0%
Good0–50
Moderate51–100
Sensitive groups101–150
Unhealthy151–200
Very unhealthy201–300
Hazardous301+

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, September 2023 · All cities in Thailand, September 2023 · Bangkok now

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SmogRank, most polluted cities in Bangkok, Thailand, PM2.5, September 2023, smogrank.com/th/region/bangkok/history/2023-09 (accessed 7 Oct 2026).

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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.