The levels of small particle matter of up to 10 microns in diameter (PM10) were recorded at 143 and 157 micrograms per cubic metre in Lampang and Lamphun respectively. The safe limit is 120.
The Lampang reading was taken in Tambon Sob Pad in Mae Mo district and Lamphun reading was recorded in Tambon Nai Muang in Muang district, said Phasit Seuksanapapat of the Chiang Mai Provincial Office for Natural Resources and Environment.
The other northern provinces’ PM10 readings remained within the safe level, he said, adding that Chiang Mai recorded a high of 106 micrograms.