Published: Nov 09, 2017, 06:31 IST | Updated: Nov 09, 2017, 06:31 IST
Illegal crop burning in the farm states surrounding New Delhi, vehicle exhaust emissions in a city with limited public transport and swirling construction dust have caused the crisis, which arises every year.
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Severe pollution
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Man with a mask
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Safety is key
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Go green to breathe
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Vehicles drive through heavy smog
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A schoolboy covers his face with a handkerchief as he waits for a passenger bus