Delhi Grinds to a Halt as Smog and Dense Fog Take Over
Delhi woke up to one of its most disruptive winter mornings as thick smog combined with dense to very dense fog, pushing visibility to near-zero levels across parts of the city. The toxic mix severely affected air travel, rail services, and daily movement, leaving residents gasping for breath and commuters stranded.
The situation marked the third consecutive day of dangerously high air pollution, with air quality firmly locked in the severe-plus category. Early morning scenes across the capital showed barely visible roads, hazy skylines, and a sharp drop in visibility that brought transport systems under immense pressure.
Zero Visibility Triggers Travel Chaos
Flights Delayed, Cancelled, and Diverted
Delhi’s Indira Gandhi International Airport remained shrouded in fog and smog from the early hours of Monday. Low visibility procedures were activated around 2:30 am as conditions worsened rapidly overnight.
By noon, over 400 flights had been delayed. At least 61 flights were cancelled, while five were diverted to other airports. Airlines warned passengers of cascading delays that could stretch well into the second half of the day.
Airport authorities confirmed that CAT-III operations were in place, allowing landings in very low visibility but still causing slowdowns due to safety protocols.
Rail Services Also Take a Hit
The impact was not limited to air travel. Northern Railways reported delays to nearly 50 trains in the Delhi division alone. Dense fog across railway tracks slowed operations, disrupting long-distance and local train schedules.
Passengers reported extended waiting times and uncertainty as trains arrived hours behind schedule.
How Bad Was the Visibility?
Fog Levels Drop to Extreme Lows
Meteorological data showed visibility touching zero at Safdarjung during the early morning hours. At Palam, near the airport, visibility dropped to around 50 metres.
According to weather officials, visibility began dropping sharply late Sunday night. By 11:30 pm, it had fallen to 150 metres, and within an hour, it reached zero in some areas. Conditions remained extremely poor until after 2 am, improving only marginally as dawn approached.
Satellite images revealed a thick fog layer stretching across the northern plains, with Delhi right at the centre of it.
What Dense and Very Dense Fog Means
Fog is classified based on visibility levels. When visibility falls below 1,000 metres, it begins to affect transport. Dense fog refers to visibility between 50 and 200 metres, while very dense fog means visibility below 50 metres.
On Monday morning, several parts of Delhi experienced conditions that fell squarely in the very dense category, making movement risky and slow.
Air Quality Remains Dangerously High
Third Straight Day in Severe-Plus Category
Delhi’s air quality showed little relief despite a marginal dip in numbers. The 24-hour rolling average AQI stood at 452 at 9 am, placing it in the severe-plus category.
This followed an AQI reading of 461 on Sunday afternoon, making it the second worst air quality day recorded this December. Saturday’s AQI stood at 431, confirming a grim pattern of three consecutive days of hazardous air.
At these levels, health experts warn that prolonged exposure can cause serious respiratory and cardiovascular problems.
Monitoring Stations Hit Maximum Levels
Out of 39 active air quality monitoring stations in Delhi, 38 reported air quality in the severe category on Sunday. Several areas recorded the maximum AQI value of 500, including Rohini, Ashok Vihar, and Wazirpur.
Other locations such as Jahangirpuri and Mundka came extremely close, with readings of 499. Only one station reported air quality slightly below severe, highlighting how widespread the pollution episode has become.
Why Delhi Is Facing This Toxic Mix
Low Winds and High Moisture Trap Pollution
Experts point to a combination of unfavourable weather conditions as the main reason behind the current crisis. Very low surface wind speeds have prevented pollutants from dispersing, allowing them to accumulate close to the ground.
At the same time, easterly winds over the weekend brought in high moisture levels, creating ideal conditions for dense fog formation. This moisture combined with trapped pollutants resulted in the thick smog blanketing the city.
Winter Temperature Inversion Makes It Worse
Delhi’s winter weather pattern further complicates the situation. Cold air near the ground gets trapped under warmer air above, creating a temperature inversion that locks pollutants close to the surface.
With no rain and minimal wind movement, emissions from vehicles, construction dust, and other urban sources continue to build up, worsening air quality day after day.
Is Any Relief on the Way?
Winds May Bring Some Improvement
Weather experts say there is cautious hope for gradual improvement later in the day. Wind direction is expected to shift from easterly to northwesterly, which could help disperse pollutants.
Surface wind speeds are also likely to pick up after noon, offering some relief from both fog and smog. However, any improvement is expected to be slow and limited.
Until then, authorities and residents remain on high alert.
Health Concerns Grow as Exposure Continues
Who Is Most at Risk
Doctors warn that severe-plus air quality can affect even healthy individuals. Common symptoms include coughing, throat irritation, breathlessness, and eye discomfort.
Children, elderly people, and those with asthma, heart disease, or other respiratory conditions are at higher risk and are advised to stay indoors as much as possible.
Safety Measures for Residents
Health experts recommend avoiding outdoor exercise, wearing protective masks if stepping out is unavoidable, and keeping windows closed. Using air purifiers indoors can help reduce exposure during peak pollution hours.
Schools and offices may also limit outdoor activities until air quality improves.
A Familiar Winter Crisis for Delhi
Each winter, Delhi braces itself for weeks of toxic air, reduced visibility, and transport disruptions. This latest episode once again highlights the city’s vulnerability during colder months.
While emergency measures and advisories help manage the immediate crisis, long-term solutions remain critical to prevent such extreme conditions from repeating year after year.
Final Thoughts
Delhi’s latest brush with zero visibility and severe-plus pollution has brought daily life to a standstill. With flights delayed, trains slowed, and health risks rising, residents are hoping for stronger winds and clearer skies.
Until weather conditions improve, caution remains the only defence against a toxic mix of fog and smog that has once again taken over the capital.
