New Delhi: Delhi's air quality deteriorated on Friday morning with several areas in the national capital recording 'severe' levels of pollution, according to authorities.

Delhi's air quality

The air quality index (AQI) on Friday was recorded at 374 as compared to 302 on the previous day.

The AQI for Delhi, however, is in the 'very poor' category, the Ministry of Earth Sciences' air quality monitor System of Air Quality and Weather Forecasting and Research (SAFAR) said.

Delhi's air qualityAn AQI between 0 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''.

Ten monitoring stations in Delhi entered the 'severe' zone which includes Alipur with AQI of 447, Shadipur with 441, Mundka with AQI of 419, Wazirpur with 432, Anand Vihar with 405, Bawana with 413, Vivek Vihar with 422, Rohini- 401, Jahangirpuri with AQI of 418 and Patparganj with 405.