As forest fires continue to occur in the far North, the border district of Mae Sai had 200 micrograms of pollutants per cubic metre, while Muang district was at 182 as of 3pm yesterday, according to the Pollution Control Department.
Other provinces with hazardous pollution levels included Mae Hong Son at 191 mcg, Phrae at 150, Phayao at 139 and Lampang’s Mae Mo district at 136.