Chiang Mai listed among world’s most-polluted cities as smog chokes northern Thailand | South China Morning Post

Dangerous levels of smog have hung heavy over the city of Chiang Mai, in northern Thailand, for weeks as farmers in neighbouring Laos and Myanmar set fire to fields and forests to prepare for the coming growing season. Chiang Mai was named the world’s third-most-polluted city by the air monitoring website IQAir as a…

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