SmogRank / World / Thailand / Bangkok / March 2026

Most polluted cities in Bangkok, Thailand, March 2026

14 cities in Bangkok, Thailand ranked by their average PM2.5 over the 31 days. Worst: Bang Na at 29.8 µg/m³, #285 of 2,947 cities in the world. Cleanest: Ban Khlong Prawet at 22.8. A city needs measurements on 70% of the days to be ranked.

About 218K people in these 5 cities breathed unhealthy air on an average day of March 2026.

Ranked by people: each city's population times its share of unhealthy days, those with a daily mean over 35.4 µg/m³ (US AQI 101+). That is how many people living there breathed unhealthy air on an average day. Only cities measured at 2 or more places at least 3 km apart are ranked: one monitor shouldn't speak for a whole city. Population is the city itself, not its wider metro area.

← Bangkok 165K 100K0
Every city in Bangkok, Thailand ranked for March 2026 with monitors in two or more places, one column each, ranked by people breathing unhealthy air: height is people on an average day, colour its average. Point at it to read a city; tap to open it.
  1. 1Bangkok
    165K
  2. 2Nong Khaem
    29.1K
  3. 3Sai Mai
    12.1K
  4. 4Lak Si
    7.08K
  5. 5Ban Khlong Prawet
    5.18K
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, March 2026 · All cities in Thailand, March 2026 · Bangkok now

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SmogRank, most polluted cities in Bangkok, Thailand, PM2.5, March 2026, smogrank.com/th/region/bangkok/history/2026-03 (accessed 6 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.