Chiang Mai hotspots down, still has world's worst airVolunteers based in Chiang Mai, assisted by volunteers from Pathum Thani, on bushfire patrol in San Sai district of Chiang Mai on Monday. (Photo: PR Chiang Mai Facebook account)CHIANG MAI - Chiang Mai city retained its crown as having the world most polluted air on Tuesday, even as the number of "hotspots" in the northern province dropped sharply. Despite the lack of hotspots in Muang district, Chiang Mai municipality was again the most polluted city in the world around 10.30am. The city's neighbouring Mae Cham district recorded 184.9 and Muang district in adjoining Lamphun province 113.8. The office specifically warned Chiang Mai residents in tambons Chang Phueak and Suthep of the high risk to health from fine dust pollution, which also plagues neighbouring Lamphun, Chiang Rai and Mae Hong Son provinces.

Source: Bangkok Post April 07, 2026 08:11 UTC