Update - https://www.bangkokpost.com/news/general/1620634/haze-shutters-city-schools
... and a call to get to the root of the problem - see https://www.bangkokpost.com/opinion/opinion/1620874Bangkok governor Aswin Kwanmuang ordered the closure of 437 schools run by the Bangkok Metropolitan Administration (BMA) until tomorrow. The order came into effect Wednesday at noon. "The decision was made to safeguard small children from health risks," Pol Gen Aswin posted on his Facebook page.
The governor said 50 drones will be deployed to spray water in critically haze-hit areas today and tomorrow, he said, adding City Hall is prepared to send mobile medical units for those affected by the by the haze over the weekend.