Air Quality Bulletin for Delhi NCR (18.11.2019 Afternoon)

1. As per AQ EWS models, the air quality is likely to remain in Poor category during the day on 18.11.2019 owing to strong surface wind but start deteriorating from evening and remain in upper end of Poor category. The air quality is likely to deteriorate on 19.11.2019 and reach upper end of very poor category owing to weak winds. The air quality is likely to further deteriorate on 20.11.2019 to remain in upper end of very poor and may reach in severe category.
2. The predominant surface wind is coming from Northwest direction in Delhi having wind speed upto 15 kmph on 18.11.2019 with partly cloudy sky, haze and strong surface winds during the day (speed 15-20 kmph).The predominant surface wind is likely be coming from North direction of Delhi having low wind speed up to 04 kmph on 19.11.2019 with mainly clear sky and shallow fog in the morning.  The predominant surface wind is likely to be calm in Delhi on 20.11.2019 with partly cloudy sky and moderate fog in the morning.
3. Predicted maximum mixing depth is likely to remain 1500 m on 18.11.2019 & 19.11.2019 and 1400 m on 20.11.2019 over Delhi. Ventilation index is likely to be 10000 m²/s on 18.11.2019, 6000m²/s on 19.11.2019 and 1000m²/s on 20.11.2019. The ventilation index lower than 6000 m²/s with average wind speed less than 10 kmph is unfavourable for dispersion of pollutants.
4. Stubble burning fire points in Haryana, Punjab and neighbouring Pakistan are observed.
5. No significant dust transport from neighbouring states in Delhi is expected.
6. Location specific AQ forecast can be seen at safar.tropmet.res.in. Detailed forecast analysis and verification can be seen at https://ews.tropmet.res.in.