Smog surrounds buildings in Bangkok/ Smog surrounds buildings in Bangkok. (Photo: Brent Lewin/Bloomberg)

Thai officials shut hundreds of schools in Bangkok on Wednesday as toxic haze hung over the city, making the capital’s air among the worst in the world.

The metropolis of about 10 million people closed 437 government schools until Friday, its local authority said. The air quality index, or AQI, exceeded 170 around lunchtime, the seventh worst urban reading globally, according to data from AirVisual, which tracks pollution levels.

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