From Saturday evening the wind speed has begun to decrease and there is a fall in temperatures too as per scientist Vijay Soni of India Meteorological department  (IMD). Due to this there are chances of rise in the levels of air pollution in Delhi. This is not a favourable situation . He said  “This is why we are also seeing a rise in air pollution levels. The winds are northwesterly and there are farm fires in Punjab and Haryana.” His view is that comparing last year farm fires are less in Haryana.  “We do not expect relief from these conditions till October 19 when wind direction is expected to become easterly temporarily. The ventilation index is too low for the dispersal of pollution,” said Soni. On Sunday the ventilation index on was around 4000 m2/s . An average windspeed of less than 10 kmph  with a ventilation index lower than 6000 m2/s ,will not be favourable one for the dispersion of pollutants . During the next two days for certain parts , conditions are individually  likely to become favourable for further withdrawal of the monsoon . As per IMD the places are Vidarbha, Chhattisgarh, Maharashtra, and Jharkhand, interior Odisha, and the rest of West Bengal. A  trough was running from this cyclonic circulation to the southwest Bay of Bengal. Around October 18 a cyclonic circulation  may form over North Andaman sea and it’s neighbourhood.