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Press Information Bureau
Government of India
Ministry of Earth Science
22 MAR 2021 3:21PM by PIB Delhi
Wind Pattern and Ventilation Index Forecast

According to the Environment Monitoring and Research Centre (EMRC) of the India Meteorological Department (IMD):

Air mass inflow forecast in Delhi along with predicted ventilation coefficient and weather forecast is as follows:

  1. The air quality over Delhi-NCR is likely to remain in Moderate category on 22.03.2021 and Moderate to Satisfactory category on 23.03.2021 and 24.03.2021. The Outlook for subsequent 5 Days: The air quality is likely to improve and remain in Moderate to Poor category.
  2. The predominant surface wind is likely to be coming from East directions of Delhi with wind speed 16-20 kmph and generally cloudy sky with very light rain/thundershowers accompanied with gusty winds (speed 40-50 kmph) on 22.03.2021. The predominant surface wind is likely to be coming from Northeast directions of Delhi with wind speed 16-20 kmph, generally cloudy sky and very light rain/thundershowers accompanied with gusty winds (speed 30-40 kmph) on 23.03.2021. The predominant surface wind is likely to be coming from Northwest directions of Delhi with wind speed 10-18 kmph and partly cloudy sky on 24.03.2021.
  3.          Predicted maximum mixing depth is likely to be approx. 3600 m on 22.03.2021, 4000 m on 23.03.2021 and 3000 m on 24.03.2021 over Delhi. Maximum Ventilation index is likely to be approx 20000 m2/s on 22.03.2021, 11000 m2/s on 23.03.2021 and 17000 m2/s on 24.03.2021. The ventilation index lower than 6000 m2/s with average wind speed less than 10 kmph is unfavourable for dispersion of pollutants.
  4. The transported dust concentration has subsided significantly. Significant long range transport of dust is not likely for next three days.
  5. Detailed forecast analysis and verification can be seen at https://ews.tropmet.res.in.
  6. Air mass inflow in Delhi along with ventilation index is attached.

(Please Click HERE for details)

 

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SS/KGS/RP/(IMD inputs)