Supreme Court again seeks presence of Chief Secretaries of Punjab, Haryana, Uttar Pradesh and Delhi after it observes that the states failed to take effective steps to deal with air pollution levels in Delhi-NCR, on November 29.

Supreme Court again seeks presence of Chief Secretaries of Punjab, Haryana, Uttar Pradesh and Delhi after it observes that the states failed to take effective steps to deal with air pollution levels in Delhi-NCR, on November 29.