NEW DELHI: Northern states are working on concrete steps to prevent large-scale crop burning that shrouds Delhi in a pall of black smoke and raises air pollution to a level that creates a health emergency and prompts people to wear surgical masks. …Punjab, Haryana and Uttar Pradesh — which have the country’s most fertile fields —have initiated steps to discourage the low-cost but polluting farm practice and discussed the matter in a recent meeting between farm ministers of states. ”
The Economic Times

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Delhi’s air quality may improve as UP, Haryana. Punjab take steps to discourage stubble burning