Chiang Mai, Chiang Mai Air quality is still critical, PM 2.5 values ??as high as 591 micrograms/cubic meter. in Chiang Dao District, ranked 4th worst in the world The forest fire haze situation in Chiang Mai is still critical. Climate Change Information Center Chiang Mai University Hourly air quality report In the Ban Hua Tho area, Chiang Dao District, at 7:00 a.m., the PM 2.5 value was as high as 591 micrograms per cubic meter. or 15 times higher than the standard value, while the IQ Air website Ranking for Chiang Mai It has the 4th worst air quality in the world and this past morning 112 hot spots were detected in 18 districts, with the highest number in Chiang Dao District at 20 spots. Source: Thai News Agency