According to the Central Pollution Control Board (CPCB) data, the Air Quality Index (AQI) 300 (very poor) was recorded at 9 am. AQI between zero and ‘good’, 51 and ‘satisfying’ between , 201 and ‘moderate’, and ‘poor’ between 201, 374 and 400 are considered ‘very poor’ and those between and 400 are considered ‘severe’.