New Delhi: The India Meteorological Department (IMD) has issued a yellow alert for dense fog in the national capital, warning that visibility may drop sharply during the early hours of Wednesday, February 4.
The most critical concern is visibility falling to around 100 metres in isolated areas during the morning hours, which could disrupt road, rail, and air travel across Delhi and parts of the National Capital Region.
Key highlights
- Date affected: February 4, 2026
- Alert issued: Yellow alert for dense fog
- Visibility: May drop to around 100 metres
- Who is affected: Early morning commuters, road and air travellers
- Immediate action: Avoid unnecessary early travel and use fog lights
Core facts from IMD
According to the IMD’s latest bulletin issued on Tuesday evening, dense fog is expected to form overnight and persist until the forenoon. Meteorological conditions remain favourable for fog formation due to high humidity levels and light surface winds.
The minimum temperature in Delhi is expected to hover around 10 degrees Celsius, while the maximum temperature may reach 22 degrees Celsius. Wind speeds are likely to remain light in the morning, ranging between 5 and 10 kilometres per hour, primarily from the northwest, contributing to the chill and limiting the dispersion of pollutants.
No rainfall has been forecast for the city during this period.
Impact and official response
The IMD has advised commuters to remain cautious during early morning travel, particularly on highways and open stretches where visibility may reduce suddenly. Aviation and railway operations may also experience minor delays if fog intensity increases.
Air quality in Delhi continues to remain in the “poor” category, with the Air Quality Index averaging around 260 on Tuesday. Officials have attributed the sustained pollution levels to local emissions combined with regional pollutant transport from neighbouring districts.
No fresh weather warnings have been issued beyond February 4, and the IMD has indicated that fog intensity may gradually reduce in the following days.
What lies ahead
From February 5 onwards, shallow to moderate fog is expected during morning hours, with daytime temperatures showing a slight rise. Skies are likely to remain clear to partly cloudy, and no precipitation is anticipated through the weekend.
Frequently asked questions
The IMD has issued a yellow alert for dense fog, warning of low visibility during early morning hours across Delhi and NCR.
Visibility may reduce to around 100 metres in isolated areas, particularly before sunrise and during the early morning period.
No rainfall has been forecast for Delhi over the next few days, with dry weather conditions expected to continue.
Air quality is likely to remain in the poor category in the short term due to calm winds and regional pollution transport.
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