On Saturday, the air quality of Delhi deteriorated back to the “poor” category. This was noticed after a day of improvement due to favourable wind speed. The Air Quality Index (AQI) of the city was 209 at 9 AM, today.
AQI was calculated on the 24-hour average recording 137, 302, and 413 on Friday, Thursday, and Wednesday respectively. An AQI ranging between zero and 50 is marked as “good”, 51 and 100 as “satisfactory”, 101 and 200 as “moderate”, 201 and 300 as “poor”, 31 and 400 as “very poor” and 401 and 500 as “severe”.
Two major reasons for improving the air quality of Delhi were stronger winds and a drastic reduction in the contribution of stubble burning. The winds comparatively slowed down during the night time which made the pollutants to pile up.
On Friday, the maximum wind speed was 18kmph. According to the India Meteorological Department (IMD), the wind speed is likely to be 15kmph on Saturday.
There has been a reduction in stubble burning in the city owing to the end of the harvesting season. As per Safar’s (Ministry of Earth Sciences) air quality monitor, the practice of stubble burning in the neighbouring states of Delhi has contributed to two per cent rise on Friday and one per cent on Thursday.
The weather department stated that the maximum temperature was likely to be around 26 degrees Celsius on Saturday.
Image Source: DNA India