National — The levels of carcinogenic particulate matter 2.5 micrometers (PM2.5) in Thailand’s Chiang Mai province has been deemed the worst in the world as of yesterday morning, March 29th. The Command Center for Preventing and Resolving Forest Fire Problems, Smog and PM2.5 Fine Dust of Chiang Mai reported yesterday morning that 334 hotspots have
Chiang Mai Air Quality Remains Dire
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