This time, the atmospheric conditions are such that the post-Diwali air quality is entirely tied to the level of firecrackers the city witnesses on the night of the festivities, experts said on Tuesday.
With an air quality index (AQI) of 306, the city's air quality was recorded as 'very poor' by the Central Pollution Control Board (CPCB) today and the possibility of it turning 'severe' is looming large.
"The level of moisture in the air will shoot up on October 20. Speed of local wind movement, which plays a crucial role in dispersing pollutants, will also be low thus resulting in accumulation of pollutants," CPCB member secretary A Sudhakar said.
Sunita Narain, a member of the Supreme Court-empowered Environment Pollution Prevention and Control Authority (EPCA), said the toxicity of the pollutants including road or construction dust increase manifold when coated with chemicals, which are present in firecrackers, and warned against measuring pollution merely going the volume of dust in air.
The 24-hour rolling average of PM 2.5, which are ultrafine pollutants 30 times finer than the width of a human hair, was 137 micrograms per cubic metre (ug/m3) today, violating the safe standard of 60 by over two times.
The volume of pollutants also rises alarmingly due to the burning of paddy stubble in Haryana and Punjab and bursting of firecrackers during the festive season.
Last year, the air quality of Delhi had plunged and a dense blanket of smog had kept the city shrouded for over a week in November, soon after the Diwali festivities, prompting the authorities to announce closure of schools among other emergency measures.
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