Smog in Chiang Mai hits highest level for year

TUESDAY, MARCH 10, 2015
Smog in Chiang Mai hits highest level for year

CHIANG MAI reported the worst smog this year Tuesday morning with tiny particles at 253 micrograms per cubic metre at an air station near Yupparat Wittayalai School, while a City Hall station recorded 247 mg per cu/m.

The amount of tiny dust in the air was double the safety level of 120 mg per cu/m, and some 2,200 residents were reportedly seeking medical treatment for smog-triggered illnesses.
The Nation