Delhi’s air high quality returned to the ‘extreme’ class Tuesday, although the contribution of farm fires to PM2.5 ranges has fallen to round 8%, in keeping with the SAFAR forecasting system. Going by NASA satellite tv for pc knowledge, the hearth depend in Punjab this yr is the best since 2016 and has just lately surpassed the hearth depend from final yr.
The cumulative hearth depend for Punjab until November 16 stood at 74,015, greater than the 72,373 recorded final yr, as per knowledge supplied by Pawan Gupta, senior scientist, Earth Sciences on the Universities Area Analysis Affiliation, NASA Marshall Area Flight Centre, USA. The information is from the Seen Infrared Imaging Radiometer Suite (VIIRS), an instrument onboard the Suomi Nationwide Polar-orbiting Partnership satellite tv for pc.
Knowledge from the identical instrument signifies that the hearth depend over the previous six years has been the best in 2016 when 84,886 counts have been recorded. That is now adopted by the determine recorded this yr. The counts fell to 46,752 in 2017, 51,998 in 2018, and 40,528 in 2019, earlier than climbing again up once more to over 72,000 in 2020.
The hearth depend from Haryana this yr is 8,879, in keeping with knowledge from VIIRS, supplied by Gupta. That is the best since 2017 when a depend of 9010 was recorded. Final yr, the depend was 5,186 for Haryana, whereas the determine in 2019 was 5,735, and in 2018 was 7,501. The very best determine up to now is from 2016, when 12,286 counts have been recorded. On the info, Gupta mentioned, “The hearth depend from the satellite tv for pc is a sign of the variety of satellite tv for pc pixels that detected the fires. Every satellite tv for pc hearth pixel can characterize one hearth or many smaller fires, and equally, one huge hearth will be seen as many hearth counts in satellite tv for pc knowledge. It is determined by satellite tv for pc decision, viewing geometry, hearth measurement and depth.”
The Central Air pollution Management Board’s every day AQI bulletin supplied an AQI of 403 for Delhi Tuesday with PM2.5 and PM10 as the principle pollution. This has worsened from an AQI of 353 Monday.
Fireplace counts have, nevertheless, been declining over the previous few days. The ‘efficient’ hearth depend from the SAFAR forecasting system on Tuesday had fallen to 1,820, down from 3,125 on Monday, and three,445 on Sunday.
An replace from the SAFAR system on Tuesday mentioned that calm circumstances and a low air flow index are pushing the air high quality into the ‘extreme’ class. The air flow index is often decided by wind pace, humidity, temperature, and the extent to which pollution can rise vertically and disperse. Wind pace and temperature at the moment are low, trapping the pollution inside Delhi, mentioned Gufran Beig, founder challenge director, SAFAR.
The SAFAR forecast for the following two days means that the intrusion of pollution from stubble burning is unlikely over the following two days because the wind course can be from the east of Delhi. However the air high quality might stand between the ‘extreme’ and the higher finish of the ‘very poor’ class until November 18.