Delhi's air quality remained in the very poor category on Thursday but may improve slightly in the coming days due to increased wind speed.
The system of Air Quality and Weather Forecasting (SAFAR) recorded an overall air quality index (AQI) of 351, which falls in the "very poor" category.
An AQI between 201 and 300 is considered poor, 301 and 400 very poor and 401 and 500 is severe.
In the national capital, Mundka recorded severe air quality while 24 areas reported very poor air quality. Eight areas recorded poor air quality, according to the CPCB.
The overall PM2.5 (fine