Chiang Mai tops most-polluted cities in global rankings

Chiang Mai tops most-polluted cities in global rankings

Chiang Mai municipality was ranked the worst among polluted major global cities on Monday, leaving its peers in the dust as the northern province continues to be battered by forest and man-made fires.

Chiang Mai Named One Of The World’s Most Polluted Cities Again

Chiang Mai municipality hit the top spot in global live pollution rankings on March 30, 2026, with AQI 263 and PM2.5 at 188.0 µg/m³ in reported figures. Live rankings can swing by the hour, but the larger picture is harder to dismiss. Northern Thailand is deep in another severe haze season. That matters far beyond […] The post Chiang Mai Named One of the World’s Most Polluted Cities Again first appeared on Chiang Rai Times.