Chiang Mai has been blanketed in toxic smog for more than a week with no signs of improvement, as PM2.5 levels continue to far exceed safe thresholds and most residents are left to manage the health risks on their own. The Climate Change Data Centre at Chiang Mai University recorded an hourly peak reading of 742 micrograms per cubic metre at the Thung Khao Phuang subdistrict health post in Chiang