New Delhi: The air quality of Delhi-NCR marginally deteriorated on Friday yet it is likely to worsen on Saturday as the fire counts in the neighbouring states rose from 502 on Thursday to 1,112 on Friday, said the System of Air Quality and Weather Forecasting And Research (SAFAR) – the forecasting body under the union ministry of earth sciences. The overall Air Quality of the city is 303 or ‘very poor’.
The overall Air Quality Index (AQI) was recorded at 283 on Friday, as against 268 on Thursday. Rising farm fires, low temperature and calm wind during night are mainly affecting the air quality.
Notably, an AQI between zero and 50 is considered good, 51 and 100 satisfactory, 101 and 200 moderate, 201 and 300 poor, 301 and 400 very poor, and 401 and 500 severe.
According to the Central Pollution Control Board (CPCB), Anand Vihar has recorded an AQI of 325 under the ‘very poor’ category, ITO’s AQI is ‘poor’ at 270, Jawaharlal Nehru Stadium ‘poor’ at 293, Shadipur ‘very poor’ at 371.
The AQI of Noida and Ghaziabad were also under the ‘poor’ category.
The share of stubble burning to Delhi’s PM2.5 rose to 20%, the highest so far this season.
According to SAFAR, the highest farm fires (1,572) were recorded this season on October 15. The number of farm fires again crossed 1,500 on October 22 but it remained below 1,000 since October 23. The highest overall AQI this season was recorded at 298 on October 17.
SAFAR in its bulletin on Friday said, “AQI is likely to deteriorate further during the day until early morning of Saturday and then likely to improve marginally from Saturday evening onwards but will remain in lower end of ‘very poor’ to ‘poor’ due to slightly improved ventilation coefficient. The transport level winds and speed are highly favourable (north-westerly) for downward transport to Delhi and the percentage share of stubble burning in Delhi’s PM2.5 has increased to 20% on Friday (fire count 1,112).”
The minimum temperature dipped to 14 degrees Celsius, two notches below normal, on Friday. It is the lowest minimum temperature recorded this season. “Calm wind causes accumulation of pollutants and low temperature affects the dispersion of pollutants. North-westerly winds are favourable for transport of pollutants released from stubble burning to Delhi,” said a Met official.