Change in the flow of wind has helped in improving Delhi’s air quality to the ‘poor’ category from the ‘very poor’ category.
After 22 days, Delhi finally saw a marked improvement in the air quality. With an overall Air Quality Index (AQI) of 280 on Wednesday morning, the air quality finally moved to the ‘poor’ category from the ‘very poor’ category.
Delhi has seen “very poor” or “severe” air quality for the rest of the days.
Officials at the India Meteorological Department said winds gusting up to 20 kmph on Sunday and 25 kmph on Monday led to a marked improvement in the air quality and visibility.
The reason why Delhi’s air quality on Sunday (349) and Monday (311) was recorded in the “very poor” category is that the AQI reading at any given time is an average of AQIs recorded in the previous 24 hours.
Neighbouring Faridabad (279), Ghaziabad (268), Greater Noida (255), Gurgaon (276) and Noida (252) also saw a marked improvement in the air quality.
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”.
The Ministry of Earth Sciences’ air quality monitor SAFAR said transport-level winds are likely to slow down and change direction from northwest to south-southeast on Wednesday leading to further improvement in the air quality, albeit within the “poor” category.
Local surface wind speed will be relatively low for the next three days and reduce dispersion of pollutants. Surface winds are likely to pick up from November 27.
The air quality is likely to be within the poor category for the next three days, it said.
Stubble burning accounted for 3 per cent of Delhi’s PM2.5 pollution on Tuesday. The Delhi government on Monday lifted the ban on construction and demolition activities in view of improvement in the air quality and the inconvenience caused to workers.
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