Red-coded hazardous smog levels again recorded in 13 areas in the upper North, with the worst pollution in Pai district of Mae Hong Son, the Pollution Control Department reported on Monday.
The department reported the unsafe levels of particulate matter 2.5 micrometres and less in diameter (PM2.5) in Chiang Mai, Chiang Rai, Lamphun, Mae Hong Son and Nan provinces.
Over the past 24 hours as of noon on Monday they ranged from 95μg/m³ per cubic metre of air in Hot district of Chiang Mai to 255 in Mae Hong Son’s Pai district.
Elsewhere the levels were 103μg/m³ in tambon Suthep of Muang district of Chiang Mai, 104 in Li…
