The city's overall score on an air quality index kept by India's top pollution authorities was 'very poor' at 384, the ministry added, and was likely to stay there until Thursday. An index range of 401 to 500 falls into the 'severe' category,

New Delhi ranks as the world's second most polluted city, after Lahore in neighbouring Pakistan, which blames India for the pollution A toxic smog shrouded India's capital city on Tuesday, driving air quality in some areas into the "severe" range ahead of winter,