FILE - In this Nov. 1, 2019, file photo, an Indian walks up to the stairs as Delhi's sky line is seen enveloped in smog and dust in New Delhi, India. Authorities in New Delhi launched an anti-pollution campaign on Monday in an attempt to curb air pollution levels ahead of winter, when the capital is regularly covered in toxic haze, and warned that filthy air could make the coronavirus pandemic more dangerous. (AP Photo/Manish Swarup, File)
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