Some parts of Delhi were shrouded by fog on Wednesday as the minimum temperature in the city dropped to four degrees Celsius, the India Meteorological Department (IMD) said.
Moderate fog lowered visibility to 201 metres at Safdarjung and to 350 metres at Palam, an IMD official said.
According to the weather department, verydensefogis when visibility is between 0 and 50 metres, 51 and 200 is dense, 201 and 500 moderate, and 501 and 1,000 shallow.
The Safdarjung Observatory, which provides representative data for the city, recorded a minimum of four degrees Celsius, which was four notches below normal.
The Lodhi Road weather station recorded a low of 3.7 degrees Celsius, according to the IMD.
The Safdarjung observatory had recorded a minimum of 3.4 degrees Celsius on Sunday, the lowest this season so far.
The minimum temperature had increased slightly on Monday and Tuesday under the influence of a fresh Western Disturbance affecting the upper reaches of the Himalayas.
The WD has withdrawn. So, the temperatures are going to drop again, Kuldeep Srivastava, the head of the IMD's regional forecasting centre said.
The WD led to light to moderate snowfall in the upper reaches of Jammu and Kashmir, Ladakh and Himachal Pradesh.
Another Western Disturbanceis likely to affect the upper Himalayan region from December 26.
Cold wave conditions arepredicted in parts of Delhi over the next three days. The mercury is expected to drop to three degrees Celsius by Friday.
Moderate to dense fog is also expected during the period, it said.
For the plains, the IMD declares acoldwavewhen the minimum temperature is 10 degrees Celsius or below and is 4.5 notches less than normal.
Delhi's air quality was recorded in the "severe" categorywith slow wind speed and low temperature allowing accumulation of pollutants, according to weather department officials.
No major improvement is predicted till December 26, Srivastava said.
The city's average air quality index (AQI) was 438 at 9 am. The 24-hour average AQI was 418on Tuesday. Itwas 332 on Monday, 321 on Sunday and 290 on Saturday.
Air pollution in the neighbouring cities of Faridabad (414), Ghaziabad (486), Greater Noida (485) and Noida (471) also remained the severe zone.
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".
Srivastava attributed thedip in the air quality to slow wind speed, low temperature, and high humidity due to the recent Western Disturbance.
(Only the headline and picture of this report may have been reworked by the Business Standard staff; the rest of the content is auto-generated from a syndicated feed.)
Dear Reader,
Business Standard has always strived hard to provide up-to-date information and commentary on developments that are of interest to you and have wider political and economic implications for the country and the world. Your encouragement and constant feedback on how to improve our offering have only made our resolve and commitment to these ideals stronger. Even during these difficult times arising out of Covid-19, we continue to remain committed to keeping you informed and updated with credible news, authoritative views and incisive commentary on topical issues of relevance.
We, however, have a request.
As we battle the economic impact of the pandemic, we need your support even more, so that we can continue to offer you more quality content. Our subscription model has seen an encouraging response from many of you, who have subscribed to our online content. More subscription to our online content can only help us achieve the goals of offering you even better and more relevant content. We believe in free, fair and credible journalism. Your support through more subscriptions can help us practise the journalism to which we are committed.
Support quality journalism and subscribe to Business Standard.
Digital Editor
RECOMMENDED FOR YOU