The Bangkok Metropolitan Administration urged people to work from home for the rest of the week if they can, with air pollution forecast to worsen after already forcing the temporary closure of more than a dozen schools.

Air quality in all of Bangkok’s 50 districts is forecast to remain in unhealthy orange or red levels until Friday because of smoke from cars and burning crops, as well as bad air ventilation, Governor Chadchart Sittipunt said at a news briefing on Tuesday. The city last week asked people to work from home on Monday and Tuesday.

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The city will ban substandard trucks from entering inner Bangkok on Thursday and Friday this week in a bid to ease the toxic air problem. As of Tuesday, 21 schools under the BMA had been closed, with students attending online classes as the pollution had started to affect students.    

Chadchart said air quality is expected to improve over the weekend because of expected better air flows.