Delhi Air Quality: Delhi's air quality index (AQI) averaged 4 at 395 pm on Sunday. (File photo)

New Delhi:

The national capital's primary weather station Safdarjung observatory recorded 8.30 mm rainfall till 7.2 pm, a Meteorological Department (IMD) official said. Which helped in the dispersion of pollutants. Delhi's air quality index (AQI) improved from 20 at 4 pm and 395 at 9 am yesterday to 400 at 10 pm.

The Air Quality Index (AQI) is the average of readings taken in the last 24 hours at
any given time. The 24-hour average AQI, recorded at 4 pm every day, was 395 on Sunday, 389 on Saturday, 415 on Friday, 390 on Thursday, 394 on Wednesday, 365 on Tuesday, 348 on Monday and 19 on November 301. Earlier in the day, a thick layer of smog engulfed Delhi, reducing visibility at the Safdarjung Observatory to just 8 metres at 600 am. Visibility at the Indira Gandhi International Airport was 800 metres.

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", 401 and 450 "severe", and 450 and above "severe-plus".

national capital has recorded 10 severe air quality days so far this November. The city recorded only three severe air quality days in November last year, while 10 such days were experienced in 2021, the highest this month since the Central Pollution Control Board (CPCB) started monitoring. According to the CPCB, there were nine such days in November 12, seven in 2020, five in 2019, seven in 2018, 2017 in 2016 and six in 10.

According to a joint project by the Delhi government and the Indian Institute of Technology (IIT)-Kanpur, stubble burning was the biggest cause of
Delhi's poor air, contributing 31 to 51 per year. In the last few days, the air pollution of the national capital has increased.

Delhi Environment Minister Gopal Rai has directed the agencies and departments concerned to ensure strict implementation on polluting vehicles and check the increasing incidents of stubble burning.