The Supreme Court on Wednesday directed the CAQM, CPCB and state pollution control boards to come out with measures to prevent air pollution within three weeks, ahead of the onset of winter when pollution levels spike.

A bench comprising Chief Justice of India (CJI) B R Gavai and Justice K Vinod Chandran also pulled up states over vacancies in their pollution control boards and asked states like Uttar Pradesh, Haryana, Rajasthan and Punjab to fill them in three months.