A thick blanket of fog, that will lift only by late morning, is expected to hit the city for three days starting Sunday.
According to the weatherman, there has been an influx of pollutants from the Indo-Gangetic Plains. This, along with the incoming western disturbance, is expected to bring conditions favourable for the formation of fog.
Fog is formed when temperatures are low, humidity is high, wind speed is low and the level of pollutants in the air is high. Recently, a scientist linked the formation of fog to the presence of particulate matter 10 in the air. Analysing data for the past two months, he found that PM 10 concentration was high on days of heavy fog.
On Saturday, the maximum temperature was recorded at 21 degrees Celsius, a degree below normal. The minimum was recorded at 6.8 degrees Celsius, also a degree below normal.
The minimum temperature had dropped to 4.2 degrees Celsius on Wednesday. The coming week will see relatively high temperatures with the minimum temperature expected to be in the range of 5 and 7 degrees Celsius.
The change in wind patterns will also bring poor air quality with it.
“The pollutants that are coming in are not local but from the Indo-Gangetic Plains. The past week was a lean period for air pollution in the city and the air remained mostly ‘poor’ as opposed to ‘very poor’ prior to that. Starting Sunday, the air quality is expected to become ‘very poor’ again. Despite the influx, though, the condition will not be as bad as it was in the second week of December,” said Gufran Beig, head of the SAFAR air quality monitoring station.
According to Beig, there is a possibility of very dense fog in the city in the beginning of next week.