New Delhi: When December entered the second week, the area would soon see an annual episode of fog that swallowed the road, a freeway and the airport blurred visibility under 1,000 meters and in extreme cases, under 50 meters with peak winter.
According to experts, FOG forecasting before 12-24 hours the incident is very difficult.
Pollution in Delhi is another component that makes it difficult for “microfics physics fog” as purified by a number of particles and droplets per cubic meter with certain moisture also imposes visibility.
Although fog formation is different in polluted and non-polluted areas, this is a special event for location and depends on meteorological factors, including moisture, wind speed, temperature and pollutants or other aerosols.
“It is very difficult to estimate the fog in terms of intensity, especially for the Delhi region, before 12-24 hours it occurs,” said RK Jenamani, senior scientist, the Indian Meteorology Department (IMD).
Data IMD shows the maximum example of the fog was reported between mid-December and mid-January, with February an exception to 2020-21.
Delhi saw 24 misty days between 2020 December and February 2021.
December saw seven fog days with low visibility affecting spanning more than 28 hours.
January saw 43 hours of fog more than 10 days and February looked 28 hours for seven days.
Similarly, the winter of 2019-20 saw 16 fog days, which December 2019 saw 47 hours for nine days and January 2020 24 hours for six days.
“In December 2020, the extreme fog episode at IGI airport was recorded on the night of December 6-7, 12-13, 15-16 and from 29 to January 1.
Similarly, in January 2021, the main fog occurred at night intervention 3- January 4, 7-8, 10-11, 12-13, 15-16, 16-17, 18-19, “said an IMD official.
Sachin Ghude, scientists in IITM and lead Fox Winter experiments (WIFEX), experiments and fog studies, said maximum fog cases were reported early in the morning and midnight, while the minimum case was reported around the afternoon, early night and evening.
However, Delhi has another problem – Haze is solid.
“In Delhi, pollution suspended particles in the air.
During the winter, around midnight, when low temperatures and humidity rises, we have seen particle pollutants absorb moisture and swell to form thick fog layers, which often make visibility very low and remain until morning , “Ghude said.
A WIFEX report shows that intense fog in northwest India has caused socio-economic impacts.
A 2017 study showed that 140 flights were canceled, while 143 was diverted and 363 delayed at IGI airport caused RS 12 Crore losses to the flight sector during the winter of 2013-14.
“However, this is reduced because IGI is now the category-3C airport, which means having equipment that allows flights to land with visibility up to 75 m.
But the plane must also have a trained support tool and pilot,” Ghude said.