As of 9am, PM10 levels at Mae Mo district’s Tambon Ban Dong (Lampang) and Muang district’s Tambon Phra Baht (Lampang) were 208 and 152 micrograms per cubic metre respectively.

In Tambon Chong Kham in Mae Hong Son’s Muang district, the reading was 171mcg.

A PM10 level exceeding 120mcg can affect people’s health.

The PCD urged related agencies to prevent unauthorised outdoor burning and to guard against forest fires while it advised younger children, the elderly and those suffering from a chronic respiratory illness to stay indoors in those areas and seek medical attention if they become sick.

People wishing to follow haze updates can visit air4thai.pcd.go.th.

Chiang Mai, Chiang Rai, Nan and Mae Hong Son provinces have implemented a 60-day ban on outdoor burning until mid-April.