Delhi NCR News

Delhi NCR News

The overall air quality index of Delhi improved to 'poor' category and was recorded at 293 on Friday, according to the data from Central Pollution Control Board (CPCB).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', according to the CPCB.