Photos: Fog and slow winds aid Delhi’s deteriorating air quality

With a dense fog cover and slow wind speeds, Delhi’s air quality index (AQI) was recorded at 355 on December 9. On a scale of 0-500, an AQI value between 301-400 is considered very poor while 401-500 is severe. The AQI in Delhi was 400 and 383 –in the very poor category, on December 7 and 8 respectively. According to System for Air Quality and Weather Forecasting And Research (SAFAR), the major factors influencing Delhi’s air quality at present include reduced ventilation index and fog formation. The air quality is likely to remain in the very poor category over the next two days and light rains are expected on December 11.

Updated on: Dec 10, 2020 11:35 AM IST

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Trees shrouded in a thick layer of fog near the banks of Yamuna river in New Delhi on December 9. As Delhi’s air quality remains in the very poor category, Indian Meteorological Department (IMD) has forecasted that Delhi is likely to receive rain on December 11 and 12, which might bring a slight improvement in the air quality that touched 317 air quality index (AQI) at 7 am on December 10. (Arvind Yadav / HT Photo)

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Commuters amid dense fog in New Delhi on December 7. The air quality remained in the very poor zone as the average air quality index (AQI) at 6am was 355 on December 9, HT reported citing Central Pollution Control Board (CPCB) data. (ANI)

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Traffic seen on a hazy morning in Burari, New Delhi on December 8. Delhi’s AQI was 383 in the very poor zone on December 8 and 400, almost touching the severe mark on December 7. (Sanchit Khanna / HT Photo)

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A cyclist rides with his face covered in a piece of cloth, at Kirti Nagar in New Delhi on December 8. According to Kuldeep Srivastava, head of IMD’s regional weather forecasting centre, no major variation is expected in the air quality over the coming week. The average wind speed on December 8 was 5-6 kmph, not favourable for dispersion of pollutants. (Sanchit Khanna / HT Photo)

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A tanker sprinkles water on the road near Pragati Maidan to curb dust pollution in New Delhi on December 9. According to the Union ministry’s air quality forecasting wing System for Air Quality and Weather Forecasting And Research (SAFAR), the share of stubble burning to the city’s PM 2.5 levels was negligible on December 8. (Arvind Yadav / HT Photo)

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A man collects water from the Yamuna river amid poor visibility due to dense fog in New Delhi on December 9. The major factors influencing Delhi’s air quality at present include reduced ventilation index and fog formation. Air quality is likely to remain in the very poor category until December 11, HT reported citing the SAFAR bulletin. (Arvind Yadav / HT Photo)

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A view of traffic on a hazy morning in Burari, New Delhi on December 8. The minimum temperature in Delhi on December 8 was recorded at 9.5 degrees Celsius, a notch above normal. The maximum settled at 28.3 degrees Celsius, four notches above normal. (Sanchit Khanna / HT Photo)

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A view of India Gate engulfed in dense fog, in New Delhi on December 8. “The wind speed is likely to remain around 10 kmph over the next three days. Also, Delhi may see very light rain or drizzle on December 11 on account of a Western Disturbance that will affect the whole of northwest India, including Delhi,” Srivastava told HT. (Amal KS / HT Photo)