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Bangkok Post
Bangkok Post
National

REVEALED: Toxic air still choking north | Rare Historical Photos

A fire truck sprays water to help clean the dense smog from the air in Muang district of Chiang Rai. (Photo: Public Relations Department)

Hazardous levels of PM2.5 were limited to northern provinces on Wednesday morning, with with the worst air pollution still in Chiang Rai's Mae Sai district, according to the Pollution Control Department.

The department reported at 10am on Wednesday that unsafe levels of particulate matter 2.5 micrometres and less in diameter (PM2.5) ranged from 58 to 320 microgrammes per cubic metre of air over the past 24 hours.

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