IT is that dreaded time of year again for Delhi and the National Capital Region (NCR), the season of high air pollution, in which Delhi regularly ranks worst in the world. Diwali is almost upon us, and the Supreme Court has imposed a total ban on firecrackers, a once unimaginable prohibition, but one that has apparently been greeted with stoicism by citizens and government authorities, who are only too familiar with the choking pall that envelops the megalopolis for several days after the festival of lights.