New Delhi: Delhi's air quality took a downturn on Sunday, plunging again into the 'very poor' category with an AQI reading of 302 after having improved to the 'moderate' level at the start of December.
The air quality had last been recorded in the 'very poor' category on November 30, with a reading of 346.
The 24-hour average Air Quality Index (AQI) of the city was recorded at 302 at 4 pm on Sunday, marking a deterioration compared to Saturday's reading of 233 (poor' category).
Of the 38 air quality monitoring stations in the city, 23 reported air quality in the 'very poor' category on Sunday, compared to only two on Saturday.
Meanwhile, 13 stations recorded air quality in the 'poor' category, and the rest were in the 'moderate' category, according to the Sameer app.
At the start of December, the air quality improved, shifting first to the 'poor' category and then further to the 'moderate' category.
But Sunday saw the air quality deteriorating sharply to the 'very poor' category from 'moderate.' The Central Pollution Control Board (CPCB) classifies AQI between 0 and 50 as "good", between 51 and 100 as "satisfactory", between 101 and 200 as "moderate", between 201 and 300 as "poor", between 301 and 400 as "very poor", and above 400 as "severe".
The primary pollutants on Sunday were PM 10 and PM2.5 with PM 10 levels recorded at 249 µg/m ³ and PM 2.5 levels at 134.4 µg/m ³ at 4 p.m.
These fine particles pose significant health risks as they can penetrate deep into the lungs and enter the bloodstream.
Meanwhile, the Decision Support System (DSS), the primary tool used to assess and estimate the sources of pollution in Delhi, has not been updated since November 29.
The latest data available on the website is from November 26 to November 29, and data for the past four days is now missing.
A Commission for Air Quality Management official stated that the DSS is still in the development phase and has not been fully commissioned yet.
"An evaluation committee reviewed the system and found that its data and accuracy were not in line with the terms of reference set for the model. It was also observed that some of the data or the emissions inventory being used was outdated," the official said on the condition of anonymity.
The DSS will resume sharing data once the necessary changes are implemented.
According to the Air Quality Early Warning System for Delhi, the city's air quality was forecast to slip into the 'very poor' category on Sunday, December 10.
The current forecast predicts that the air quality is likely to remain in the 'poor' category on Monday but is expected to deteriorate to the 'very poor' category on Tuesday.
(This report has been published as part of the auto-generated syndicate wire feed. Apart from the headline, no editing has been done in the copy by ABP Live.)