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Assessments by the CPCB (Central Pollution Control Board) suggest the national capital is home to and surrounded by critically polluted industrial clusters that do not meet air, water or soil pollution parameters, contributing to the city’s grimy air and poor water quality. The Najafgarh drain basin in Delhi, which includes the Anand Parbat, Naraina, Okhla and Wazirpur industrial areas, is the second most polluted cluster in India, with air and water in the “critical” category and soil in “severe” category when it comes to toxic content, according to unpublished CPCB data. CPCB has compiled and submitted a list of critically polluted industrial clusters that were monitored in 2018 to the NGT (National Green Tribunal), which referred to the list in an order dated July 10, 2019.