Economy Delhi's air pollution on rise, slips to 'very poor' category: Authorities Updated : January 24, 2019 04:11 PM IST According to the Central Pollution Control Board (CPCB) data, the overall AQI in the city was 328. An AQI between 100 and 200 comes under the 'moderate' category, 201 and 300 is considered 'poor', 301 and 400 'very poor', while that between 401 and 500 is 'severe'. Subscribe to Moneycontrol PRO at just Rs.33/- per month for the first year. Use code SUPERPRO. Limited period offer. Available on Web and Android.