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The air pollution data in the capital is currently taken from 13 monitoring stations – six run by Delhi Pollution Control Committee (DPCC) and seven by Central Pollution Control Board (CPCB). The city of about 20 million people, which ranks among the world’s top cities with foul air on a WHO list, has been struggling to clean up its air that contains a toxic cocktail of dust, smoke and gases from vehicle and factory exhausts. The condition worsens every autumn and winter as the city, buffeted by farmers burning crop stalks in neighbouring states and atmospheric changes, records higher levels of air pollution.