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Delhi: Trucks stop due to traffic, schools close because of smog

The smog in Delhi, India has caused the city’s traffic to come to a standstill and many schools have closed because of it. The level of pollution in the air is so high that it has even been classified as a “severe” air quality emergency by the Indian state government.  The main cause of the thick haze is the burning of crop residue, which reacts with sunlight and produces particles called PM10s. PM10s are small enough to be absorbed by the lungs read more