The National Environment Board (NEB) will beef up preventive measures against PM2.5 ultrafine dust after 17 northern provinces have seen smog pollution hit crisis levels.
Siwaporn Rungsiyanon, a spokeswoman of the Centre for Air Pollution Mitigation (CAPM), said the 17 provinces have been seeing PM2.5 levels in excess of 100 microgrammes per cubic metre (µg/m3) since the middle of last month, as a result of slash-and-burn activities in nearby forests and farms.
