A plan to combat air pollution in New Delhi was announced by authorities Friday, as the Indian capital looks to lighten the toxic smog blanket that chokes the city, especially in winter. Delhi is one of the world’s most polluted cities and each winter, seasonal crop stubble burning, dense cloud cover and smoke from millions of Diwali firecrackers turn its skies a putrid yellow. Delhi chief minister Arvind Kejriwal said Friday that the road-rationing scheme would be in place between November 4-15, meaning cars with odd and even plates would be allowed on alternate days in that period.