By Niladry Sarkar.
There are depression in eastern India, which does not allow free flow of air from north or north west resulting in calm condition both in the upper and lower atmosphere.
Delhi’s air quality turned ‘severe’ on Tuesday for the first time this season with stubble burning intensifying in neighbouring states, authorities said.
The Centre-run System of Air Quality Forecasting And Research (SAFAR) recorded the AQI at 410, falling in the ‘severe’ category, the highest this season
Eighteen areas of Delhi recorded ‘severe’ air quality with the highest AQI at 4 PM recorded at Anand Vihar at 467, other than Faridabad, Ghaziabad, Gurgaon and Noida which also recorded severe air quality.
Click on the link to understand how the AQI is measured.
Infographic: Quality of air according to AQI. – https://t.co/tMZzCDi0Ub
— Niladry Sarkar (@niladry17) October 31, 2018
A SAFAR official said pollution is likely to increase faster now with lead pollutant as PM10 because of new development as shown by SAFAR-model where it is indicating that western disturbances may hit over western Himalayan region from October 31.
“Lot of moisture is already getting introduced in Delhi sky as an early signature. The withdrawal will bring even more moisture in the air and result in fall in temperature. Upper winds already turned north-westerly (stubble site) today. Only favourable thing is that upper wind speed is moderate and fire counts are low,” the official said.
— Ramdomness (@csramachandran) October 31, 2018