Hazardous smog again in North

Hazardous smog again in North

Park rangers collect dry leaves in a bid to stop a forest fire spreading in Phu Sang National Park in Phayao province on Thursday. (Photo by Sai-arun Pinaduang)
Park rangers collect dry leaves in a bid to stop a forest fire spreading in Phu Sang National Park in Phayao province on Thursday. (Photo by Sai-arun Pinaduang)

Unhealthy smog levels are again being recorded in nine northern provinces and a central plains province, with the worst air again in Chiang Rai, the Pollution Control Department reported.

Director-general Pralong Damrongthai said hazardous levels of air pollution were detected in Chiang Mai, Chiang Rai, Lampang, Lamphun, Mae Hong Son, Nan, Phayao, Phrae and Tak provinces, and Nakhon Sawan province in the Central Plain.

Levels of particulate matter 2.5 micrometres or less in diameter (PM2.5) were measured at 51-194 microgrammes per cubic metre of air in the 24 hours to 9am Friday. The safe threshold for PM2.5 is set at 50μc³ in Thailand.

The highest reading, 194μc³, was in tambon Wiang Phang Kham of Mae Sai district in Chiang Rai, he said. The low end, 51μc³, was in tambon Pak Nam Pho of Muang district in Nakhon Sawan. 


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