As per the SAFAR-India, the city's AQI has been in the 'very poor' category since Sunday (309). The AQI from 0 to 100 is considered 'good', while from 100 to 200 it is 'moderate', from 200 to 300 it is 'poor', from 300 to 400 it is said to be 'very poor' and from 400 to 500 or above it is considered 'severe'.