A layer of smog diminished visibility throughout morning hours. Local sources of air pollution together with meteorological components, together with calm or gentle wind, low temperature and low mixing layer top, affected the air high quality.
Experts mentioned the layer of the ambiance, which comes nearer to the floor when temperatures drop, trapped the pollution. With low temperatures persisting in the area for the previous few days, the blending layer top was low. While low temperature slows down the dispersal of pollution, calm or gentle winds trigger pollution to accumulate. The share of stubble burning to Delhi’s PM2.5 was solely 2% on Wednesday.
RK Jenamani, senior scientist at India Meteorological Department (IMD), mentioned, “The wind blew at a speed of 5-10 kmph in the afternoon, but it became calm in the evening. The wind speed is predicted to remain low for the next two days. The visibility was 800-1,200 metres during morning hours, but it improved to 1,500-3,000 meters during daytime.”
Dipankar Saha, former head of Central Pollution Control Board’s air laboratory, mentioned, “Mixing layer height is 700 metres, not enough for dispersion.”
On Wednesday, TOI had reported that although the general AQI had improved to 290 on Tuesday due to average winds, it deteriorated at evening and touched the “very poor” class as wind velocity dropped to nil.
System of Air Quality and Weather Forecasting And Research mentioned, “Local surface winds are relatively low for the next three days. Air quality is likely to be in the higher end of the very poor category for the next two days. On November 27, local surface winds are likely to increase resulting in improvement in air quality, but expected to stay within the very poor category. The effective fire count is 432. With the onset of winter, local weather is likely to dominate in determining air quality.”
According to air high quality early warning system for Delhi, the air high quality was possible to stay in the “very poor” class for the subsequent 5 days and PM2.5 could be the distinguished pollutant. Gradual enchancment in air high quality was possible from November 27.