Air pollution in the Thai capital forced more than 350 schools to close on Friday, city authorities said, the highest number in five years. Bangkok officials also announced free public transport for a week in a bid to reduce traffic in a city notorious for noxious exhaust fumes.

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.