SmogRank / World / Thailand / May 2023

Most polluted cities in Thailand, May 2023

1 city in Thailand ranked by their average PM2.5 over the 31 days. Worst: Tha Bo at 30.2 µg/m³, #28 of 1,267 cities in the world. A city needs measurements on 70% of the days to be ranked.

  1. 1Tha BoNong Khai
    90
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 2023 · Thailand now

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SmogRank, most polluted cities in Thailand, PM2.5, May 2023, smogrank.com/th/history/2023-05 (accessed 2 Oct 2026).

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