The problem of smog and small dust PM2.5 in Chiang Mai, Thailand by Pongmanat Tasiri / SOPA Images
On Thursday 09 March 2023, Chiang Mai was still listed as the world's worst, on IQAir – a technology partner of the United Nations Environmental Programme. IQAir’s city pollution rankings compare 95 global cities worldwide with measured PM2.5 data.
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