<span style="color: #222222;">The overall air quality in Delhi-NCR has slipped to the very poor category. According to the Central Pollution Control Board (CPCB), the city's Air Quality Index was recorded at 396 at 7 AM this morning. An Air Quality Index, AQI between 201 and 300 is considered poor, 301 to 400 very poor and 401 to 500 severe.</span><br />