In the last 24 years, Delhi’s air quality has remained unchanged in the very poor category for the second day in a row. The air quality of the national capital on Wednesday improved from severe to very poor with the overall AQI at 382 on Thursday.
The Central Pollution Control Board said that AQI for the capital at 8 am was 344. Wednesday’s AQI reading was 375.
According to a short range forecast from SAFAR, “The AQI is in the middle range of ‘very poor’ category as predicted. Winds at transport level are likely to increase in speed for the next two days and the direction (coming from northwest) is also favourable for transport of stubble-related pollutants to Delhi as fire counts are also increasing. Air quality is expected to deteriorate for the next 2 days but remains in the upper end of very poor or touch lower end of severe category intermittently. Calm local surface winds may cause stagnation conditions that weaken dispersion. Today’s share of crop residue burning is 27% in PM2.5 and effective fire count is 5,317. Air quality is likely to improve on 13th Nov.”
“The AQI today (Wednesday) indicates a very poor category and is likely to improve but remain the same for the next two days as transport-level winds are coming from the eastern direction, preventing the intrusion of pollutants from the upwind region,” it said.
“Local surface winds are low… resulting in poor ventilation of near-surface pollutants. From November 20, surface winds are likely to be strong, resulting in effective dispersion that improves air quality. The effective farm fire count is 2,643 and its contribution to New Delhi’s PM2.5 today (Wednesday) is 6%,” SAFAR said.
According to the reports, the factors that are responsible for influencing Delhi air quality was excessive burning. Other than this, moderately high local wind speed is also deteriorating the state of air quality as it causes less accumulation of pollutants and moderate ventilation factor causing adequate dispersion.
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