Air quality dips every year ahead of winter, when calm and cold winds trap pollutants from sources including vehicles, industries, construction dust, and agricultural waste burning. Delhi has stopped local construction, closed primary schools till Nov. 10 and will impose restrictions on use of vehicles next week to fight pollution, but it wants its neighbouring states to control crop residue burning. At 2 p.m. on Tuesday, the real time air quality index stood at 306, a level categorised as 'hazardous' by Swiss group IQAir. "We direct the state government of Punjab and adjacent states to Delhi - Haryana, Rajasthan and Uttar Pradesh - to ensure that crop (residue) burning is stopped forthwith," Supreme Court judge Justice Sanjay Kishan Kaul said. Farmers in Punjab and Haryana usually burn crop stubble left behind after rice is harvested in late October or early November to quickly clear their fields before planting wheat crops.

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Persons: Anushree, Boulton, Sanjay Kishan Kaul, SAFAR, Justice Kaul, Kaul, Simon Cameron, Moore Organizations: REUTERS, NEW, Farmers, Thomson Locations: Karnal district, Haryana, India, NEW DELHI, New Delhi, Delhi, Swiss, Punjab, Rajasthan, Uttar Pradesh