The Pollution Control Department reported 12 spots in the upper North with red-coded, seriously hazardous levels of PM2.5 on Tuesday morning, and the worst air pollution in Chiang Mai province.
The seriously hazardous levels of particulate matter 2.5 micrometres and less in diameter ranged from 92 to 218 microgrammes per cubic metre of air over 24 hours at these 12 locations as of 11am.
The readings were:
- 92μg/m³ in Muang district of Nan province,
- 97 in Hot district of Chiang Mai
- 100 in Mae Cham district of Chiang Mai
- 103 in Mae Sariang district of Mae Hong Son
- 110 in Muang district of Phayao
- 117 in Muang district of Chiang…
