Delhi mist: Schools and universities will be closed as pollution worsens

A mix of factors such as vehicle and industrial emissions, dust and weather conditions make Delhi the most polluted capital in the world. The air becomes especially toxic during the winter months, when farmers in neighboring countries burn stubble. And fireworks during the Diwali festival, which takes place at the same time, only worsen the air quality. Slow wind speeds also play a role in trapping contaminants in the lower atmosphere.

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