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 Ranked Most Polluted City Globally Amid Fires

Chiang Mai was ranked the most polluted major city in the world on Monday 30 March, as forest and man-made fires pushed air quality to hazardous levels across the northern province. Swiss air monitoring firm IQAir reported an Air Quality Index (AQI) of 263 at 10am, classified as “very unhealthy”,...

Chiang Mai Ranks as World’s Most Polluted City as Wildfires Blanket Northern Thailand

CHIANG MAI — Chiang Mai was named the world’s most polluted city on Monday, as smoke from more than 600 wildfires blanketed the northern region, prompting authorities to launch aerial water-dropping operations in an attempt to quell the blazes. Forest Fires Blanket Chiang Mai with Air Pollution Satellite imagery revealed hundreds of “hotspots” across Northern […] Source

Chiang Mai under a blanket of toxic air as warning signs reach Pattaya

PATTAYA, Thailand – Chiang Mai has once again climbed to the top of the world’s worst air quality rankings on March 30, with pollution levels reaching alarming and dangerous extremes — raising concerns that other parts of Thailand, including Pattaya, could soon feel the impact. A thick blanket of toxic haze has engulfed the northern […]

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.