Any reading under 120 micrograms per cubic metre of air is considered safe.
Disaster Prevention and Mitigation Department chief Chatchai Phromlert said yesterday the areas with “health affecting” levels of particulate matter of up to 10 microns in size were Songkhla’s Hat Yai district (156 mcg), Pattani (139 micrograms), Narathiwat (136 mcg), Satun (128 mcg) and Yala (128 mcg).
He said all relevant agencies were continuing haze reductions efforts in a bid to reduce the effects on people.