The thick cover of smog that covers Delhi during the winter months is back — only much sooner this time. The Indian capital, which was ranked as the world’s most polluted city by the World Health Organization (WHO) in 2014, has seen a sharp drop in its air quality over the last few days. The culprit is the annual burning of crop residues by farmers in the neighbouring state of Punjab.
See also: Heartwrenching photos of the world’s smoggiest cities
On October 30, NASA captured this image of fires burning in the Indian state of Punjab. Red outlines indicate hot spots where the sensor detected unusually warm surface temperatures associated with agricultural fires …
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Delhi is set to retain its status as the world's most polluted city
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