Office executive Dr Surasing Wisaruthrat Monday said that 70,000 - 80,000 facemasks would also be given to at-risk persons, especially those living in outer districts where field burning and wildfire usually occurred.
Tiny particles at downtown Chiang Mai were reported at 134 micrograms per cubic metre at Tambon Chang Pheuk and at 155 mg per cu/m at Tambon Sri Phum, which were beyond the safety level of 120 mg per cu/m.
The Nation