Air quality in Delhi was recorded highly noxious with Average Air Quality Index (AAQI) recorded at 352 microgram per cubic on the National Ambient Air Quality Index (NAAQI) on Tuesday.
Values of both the pollutants were also recorded under Very Poor category. Six areas — Ashok Vihar, Anand Vihar, Burari, Mundaka, Nehru Nagar and Wazirpur — recorded severe air quality, according to the Central Pollution Control Board(CPCB).
The Particulate Matter - 2.5 (fine particulate matter in the air with a diameter of less than 2.5 micrometre) level was recorded at 208 and the PM10 level at 397.
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 is considered to be "severe".
Six areas — Ashok Vihar, Anand Vihar, Burari, Mundaka, Nehru Nagar and Wazirpur — recorded severe air quality, according to the CPCB.
Twenty-five areas of the national capital recorded "very poor" air quality, while in four areas it was in the "poor" category, it said.
The PM2.5 (fine particulate matter in the air with a diameter of less than 2.5 micrometre) level was recorded at 208 and the PM10 level at 397, it added.
Ghaziabad recorded severe pollution level at 404 while Faridabad and Noida recorded "very poor" air quality, according to the CPCB data.
In Gurugram, the air quality was "poor", it said.The Centre-run System of Air Quality and Weather Forecasting (SAFAR) said the air quality index dropped speedily as expected, but remained "very poor".
"Although increasing-AQI trend is predicted from tonight (Tuesday Night)for the next two days, it will remain in 'very poor' range only.
This is mainly due to decline in wind speed along with adverse meteorological conditions. The contribution from long-range dust or stubble biomass is negligible," the SAFAR said.
According to the Indian Institute of Tropical Meteorology (IITM), the maximum ventilation index is likely to be 3,500 sqm/second on Tuesday. A ventilation index lower than 6,000 sqm/second with average wind speed less than 10 kmph is unfavourable for dispersion of pollutants, the IITM said.
