Air pollution has become a seasonal problem in Thailand. - Reuters
BANGKOK (The Nation/Asia News Network): Fine dust levels in the northern city of Chiang Mai have risen beyond safe levels for five consecutive days, the provincial authorities announced on Sunday.
Chiang Mai governor Nirat Pongsitthavorn said the concentration of PM2.5 particulate matter had risen beyond the safe level of 50 micrograms per cubic metre of air (μg/m3) mainly due to forest fires.
