SmogRank / Countries / Thailand / July 2026

Most polluted cities in Thailand, July 2026

6 cities in Thailand ranked by their average PM2.5 over the 31 days. Worst: Chiang Mai at 13.1 µg/m³, #546 of 2,262 cities in the world. Cleanest: Sai Mai at 6.2. A city needs measurements on 70% of the days to be ranked.

  1. 1Chiang Mailow-cost sensorsChiang Mai
    13.1
  2. 2Uttaraditlow-cost sensorsUttaradit
    11.8
  3. 3Khlong Luanglow-cost sensorsPathum Thani
    9.7
  4. 4Bangkoklow-cost sensorsBangkok
    8.3
  5. 5Bang Pakonglow-cost sensorsChachoengsao
    6.3
  6. 6Sai Mailow-cost sensorsBangkok
    6.2
Good0–9.0
Moderate9.1–35.4
Sensitive groups35.5–55.4
Unhealthy55.5–125.4
Very unhealthy125.5–225.4
Hazardous225.5+

All cities in the world, July 2026 · Thailand now