This story is from November 29, 2019

Delhi: With AQI of 106, air cleanest since October 5

Light rain in parts of the capital on Thursday morning further improved the city’s air quality for the second consecutive day. The daily air quality index clocked 106, putting Delhi air in moderate category, the cleanest since October 5 (98). The AQI further improved to 77 in satisfactory zone at 8.40pm, according to the Central Pollution Control Board’s website.
Delhi: With AQI of 106, air cleanest since October 5
Sudden rain in Delhi NCR on Wednesday.
NEW DELHI: Light rain in parts of the capital on Thursday morning further improved the city’s air quality for the second consecutive day. The daily air quality index clocked 106, putting Delhi air in moderate category, the cleanest since October 5 (98). The AQI further improved to 77 in satisfactory zone at 8.40pm, according to the Central Pollution Control Board’s website.

NCR towns of Ghaziabad (105), Greater Noida (110), Gurugram (112) and Noida (101) also recorded “moderate” air quality on Thursday, according to the daily AQI readings. An AQI between 201 and 300 is classified as in ‘poor’ category, between 301 and 400 is classified as ‘very poor’ and between 401 and 500 is ‘severe’ on CPCB’s index.
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According to the CPCB central control room, the 24-hour average PM2.5 and PM10 readings were well within the safe standards on Thursday. In fact, PM2.5 concentration remained in the safe limits from 10.30pm on Wednesday to all through Thursday.
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While NCR’s average PM2.5 was 44.6 micrograms per cubic metre at 5pm, the average PM10 concentration was 78.1 micrograms per cubic metre. It improved further to 34.2 micrograms per cubic metre and 62.9 micrograms per cubic metre at 8pm. The safe standards are 60 and 100 micrograms per cubic metre for PM2.5 and PM10 concentrations, respectively.

“Under the influence of western disturbance, fairly widespread rain was recorded, improving the air quality. The AQI, however, is likely to deteriorate marginally to ‘poor’ category in the next two days,” a SAFAR report stated.
According to a Met official, high surface wind speed has helped clean up Delhi air substantially. “As the wind speed will drop in the next couple of days, a little deterioration in air quality is expected. But as there is not much impact of stubble burning, the rain over the past two days will help disperse the local pollutants,” the official told TOI.
According to SAFAR, 17 fires were counted. As the stubble transport-level winds are easterly currently, no significant stubble impact is expected in Delhi for Friday. Northerly or northwesterly winds impact Delhi-NCR’s air quality by bringing in crop residue plume.
The impact of stubble burning emission in the capital is PM2.5 was 2% on Thursday, 4% on Friday and is expected to be 5% on Saturday, a SAFAR report stated
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