He said with the present trends, it was expected that the decline in the particular matter (PM) levels would continue and the air quality was likely to fall back in the severe category.
"There is a declining trend in the levels of particulate matter at present, indicating an improvement in air quality due to the efforts made by implementing agencies," he said.
Pollution levels had skyrocketed by the hour in Delhi yesterday, turning the air quality hazardous, which agencies consider unfit for inhalation even by healthier people.
"With the present trend, it is expected that the decline in particulate matter levels will continue and air quality is likely to fall back in the severe category," he said.
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Vardhan said the present air quality in the Delhi-NCR has been in the severe plus category and emergency conditions as a result of adverse weather conditions due to western disturbances, stubble burning and high levels of relative humidity.
He said initially the conditions started on November 7 and declined to severe category (concentration less than 500 micrograms per cubic metre for PM10 and less than 300 micrograms per cubic metre for PM2.5) on November 11.
The environment ministry had earlier set up a high-level committee to propose and monitor solutions to air pollution, which has risen to dangerous levels in and around Delhi, raising serious health concerns.