Delhi's air quality was recorded in the "poor" category on Wednesday morning, according to monitoring agencies. The capital's AQI was recorded at 254 at around 8 am.
Earlier on Tuesday, the AQI had improved marginally but remained in the similar category. The 24-hour average AQI settled at 218 in neighbouring Ghaziabad, 179 in Faridabad, 158 in Gurugram, 170 in Noida and 248 in Greater Noida.
It may be noted that 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', and 401 and 500 'severe'.
Delhi's air quality on Sunday had turned 'very poor' for the first time since May, mainly due to a drop in temperature and wind speed, which allowed pollutants to accumulate. A few incidents of firecracker burning were also reported from parts of Delhi on the occasion of Dussehra on Tuesday.
In accordance with the practice of the last three years, Delhi had last month announced a comprehensive ban on the manufacture, storage, sale and use of firecrackers within the capital city.
A public awareness campaign, 'Patakhe Nahi Diye Jalao', will be soon reintroduced to discourage burning of firecrackers.
Unfavourable meteorological conditions and a cocktail of emissions from firecrackers and paddy straw burning, in addition to local sources of pollution, push Delhi-NCR's air quality to hazardous levels around Diwali every year.
(With inputs from PTI)