INFO:

Delhi's air quality on Saturday remained in the 'very poor' category with the overall Air Quality Index (AQI) recorded at 311 at 9 am, Central Pollution Control Board (CPCB) data showed. An AQI between zero and 50 is considered 'good', 51 and 100 'satisfactory', 101 and 200 'moderate', 201 and 300 'poor', 301 and 400 'very poor', and 401 and 500 'severe'.