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Indian visitors sit on the steps outside Jama Masjid amid heavy smog in the old quarters of New Delhi on November 8, 2017.
Delhi shut all primary schools on November 8 as pollution levels hit nearly 30 times the World Health Organization safe level, prompting doctors in the Indian capital to warn of a public health emergency. Dense grey smog shrouded the roads of the world's most polluted capital, where many pedestrians and bikers wore masks or covered their mouths with handkerchiefs and scarves.
 / AFP PHOTO / Sajjad HUSSAIN        (Photo credit should read SAJJAD HUSSAIN/AFP/Getty Images)
Indian visitors sit on the steps outside Jama Masjid amid heavy smog in the old quarters of New Delhi on November 8, 2017.
Delhi shut all primary schools on November 8 as pollution levels hit nearly 30 times the World Health Organization safe level, prompting doctors in the Indian capital to warn of a public health emergency. Dense grey smog shrouded the roads of the world's most polluted capital, where many pedestrians and bikers wore masks or covered their mouths with handkerchiefs and scarves.
 / AFP PHOTO / Sajjad HUSSAIN        (Photo credit should read SAJJAD HUSSAIN/AFP/Getty Images)

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    See how bad Delhi's pollution is

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See how bad Delhi's pollution is

India's capital is blanketed in heavy smog, with air so polluted that breathing it in is considered roughly equivalent to smoking 44 cigarettes a day.

See how bad Delhi's pollution is

India's capital is blanketed in heavy smog, with air so polluted that breathing it in is considered roughly equivalent to smoking 44 cigarettes a day.