Nine provinces in the North have been hit by haze for over a week, with Chiang Rai's Mae Sai district reporting the highest level of PM10 fine-particle dust yesterday.
Many residents were seen wearing facemasks outdoors.
The Pollution Control Department’s Air Quality and Noise Management Bureau reported the situation in the nine provinces via the website air4thai.pcd.go.th. It said Mae Sai had PM10 dust at 215 mcg/m3, which was way beyond the safe level of 120 mcg/m3, while its air quality index (AQI) of 143. Muang Chiang Rai reported PM10 dust at 190 mcg/m3 and an AQI of 131.
Chiang Mai’s Muang district saw tambon Sri Phum record a PM10 of 128 mcg/m3 and tambon Chang Pheuk 139 mcg/m3, while Mae Hong Son’s Muang district reported a PM10 of 186 mcg/m3. Nan had 135 mcg/m3, Phrae 125 mcg/m3 and Phayao 164 mcg/m3. Lampang, Lamphun and Tak reported moderate air quality a PM10 of 119 mcg/m3, 98 mcg/m3 and 68 mcg/m3 respectively.