The air-quality across the NCR was very poor, according to System of Air Quality and Weather Forecasting And Research (SAFAR).
Delhi continued to choke even on Sunday as the air quality remained in the 'severe' category owing to unfavourable weather conditions and a significant increase in stubble burning cases, authorities said.
The overall air quality index (AQI) was recorded at 423, according to data from the Central Pollution Control Board.
The city's air quality was recorded in the "very poor" category on Saturday morning, but it again slipped to the severe level in the evening.
On Sunday, the PM2.5 (particles in the air with a diameter of less than 2.5 micrometres) level was recorded at 299, while the PM10 (particles in the air with a diameter of less than 10 micrometres) level was recorded at 477, according to data from the CPCB.
Twenty-eight areas in Delhi recorded air quality in the "severe" category, while seven areas recorded "very poor" air quality, according to the CPCB.
An 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".
ALSO READ | Delhi continues to choke as air quality turns 'severe' again, EPCA extends ban on construction and truck entry till Nov 12
There has been a dramatic rise in air pollution in many areas in Delhi post Diwali, mainly due to burning of firecrackers and stubble burning. Officials have warned of further deterioration over the next two days since the he wind is bringing in particulates from the northwest, where farm fires have been raging. “The concentration of PM 2.5 – the more harmful of the particulates – would remain in the severe or severe+ (emergency) category till November 11", officials said.
Stubble burning in neighbouring states of Delhi on Thursday was the "largest-ever recorded" this year which might lead to a further deterioration in the already "severe" air quality of the national capital, the IITM said on Friday.
It said about 2,100 fire counts were observed on Thursday over north western region of India.
The air quality in Delhi has been severe for the past two days with the highest pollution level of the year recorded a day after Diwali on Thursday at an AQI of 642.
Amid rising concerns over increasing pollution in Delhi, the Environment Pollution (Prevention and Control) Authority (EPCA) has extended the ban on industies using coal and biomass including brick klins, entry of truck traffic to Delhi and construction activities till November 12. However, the ban does not include power plants.
