Prime Minister Prayuth Chan-ocha has ordered urgent steps to put out forest fires in Nakhon Nayok province to the east of Bangkok and those in the country’s northern region.
Many schools in Laos have been closed as the country is experiencing unprecedented high levels of PM2.5 - airborne particles less than 2.5 micrometres in diameter - due to wildfires and farmers burning scrubland in preparation for crop planting.
Hazardous levels of PM2.5 were limited to northern provinces on Wednesday morning, with with the worst air pollution still in Chiang Rai's Mae Sai district, according to the Pollution Control Department.
Parts of the upper North and Northeast remained cloaked in hazardous levels of smoke haze on Tuesday, with with the worst pollution still in Chiang Rai's Mae Sai district.