Urgent : Schools in Bangkok close as air pollution worsens

WEDNESDAY, JANUARY 30, 2019

The Bangkok governor on Wednesday ordered the suspension of classes at 437 schools under Bangkok Metropolitan Administration for the safety of students after 26 zones in the capital were declared air pollution control areas.

Aswin Kwanmuang said the suspension started at noon today and continue until Friday.
The decision followed the Pollution Control Department's report of unsafe levels of PM2.5 - airborne particulates 2.5 microns or less in diameter - in 39 locales in and around the city, of which 23 were along main roads. 
The level hit 141 micrograms of PM2.5 per cubic metre of air - nearly three times the safe limit of 50 - on Rama II Road in Muang Samut Sakhon.