SmogRank / World / Thailand / Bangkok / May 2025

Most unhealthy days in Bangkok, Thailand, May 2025

14 cities in Bangkok, Thailand ranked by their share of unhealthy days over the 31 days. The most unhealthy days: Bang Na, Thailand, 0 of 24 measured days. 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.

← Bang Na 0% 0.75%0
Every city in Bangkok, Thailand ranked for May 2025, 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. 1Bang Na
    0 of 24
  2. 2Khlong Sam Wa
    0 of 24
  3. 3Ban Samae Dam
    0 of 24
  4. 3Saphan Sung
    0 of 24
  5. 5Khan Na Yao
    0 of 24
  6. 6Bangkok
    0 of 24
  7. 7Nong Khaem
    0 of 24
  8. 8Bang Kapi
    0 of 24
  9. 9Lat Krabang
    0 of 24
  10. 10Sai Mai
    0 of 24
  11. 11Ban Khlong Prawet
    0 of 24
  12. 12Bueng Kum
    0 of 24
  13. 13Lak Si
    0 of 24
  14. 14Nong Chok
    0 of 24
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, May 2025 · All cities in Thailand, May 2025 · Bangkok now

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SmogRank, most polluted cities in Bangkok, Thailand, by unhealthy days, PM2.5, May 2025, smogrank.com/th/region/bangkok/history/2025-05?by=days (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.