North India Blanketed by Dense Fog: Red Alert Issued in Delhi, Uttar Pradesh, Punjab and Haryana; Over 150 Flights Cancelled

A thick layer of fog engulfed large swathes of North India early this week, prompting red alerts and travel chaos across major states including Delhi, Uttar Pradesh, Punjab, and Haryana. The extreme reduction in visibility disrupted daily life, affected major transportation networks, and intensified public health concerns. Meteorological experts warn that the situation may persist for several days as cold wave conditions intensify across the region.

Severely Reduced Visibility

According to reports from major airports and traffic control units, the dense fog brought visibility levels down to near zero in many places before sunrise. Delhi’s Indira Gandhi International Airport recorded runway visibility of less than 100 meters intermittently through the early morning hours, forcing aviation authorities to divert and cancel several scheduled domestic and international flights. By afternoon, more than 150 flights had been delayed, rescheduled, or cancelled due to operational constraints.

In Uttar Pradesh, road and rail traffic also suffered significantly. Highways connecting Lucknow, Kanpur, Prayagraj, and Varanasi experienced multi-kilometre traffic bottlenecks as drivers struggled to navigate the enveloping fog. Similar disruptions were reported on the Yamuna Expressway and the Delhi–Agra National Highway, where low visibility forced authorities to temporarily restrict vehicular speeds.

Punjab and Haryana bore the brunt of the dense fog as well, with farming communities reporting delays in supply chain logistics. Early morning produce transport was halted in districts such as Ludhiana, Karnal, Amritsar, and Ambala due to unfavourable travel conditions.

Red Alert Issued Across Multiple States

The meteorological department issued a red alert for dense fog and cold wave conditions across the affected states. A red alert signifies the highest level of warning, signalling both severity of the weather pattern and potential risks to life and property. Citizens were advised to limit early morning or late evening travel, drive with fog lights, and avoid stepping outdoors unnecessarily in low-visibility hours.

Authorities also asked educational institutions to consider adjusting school timings to protect young children from exposure to extreme cold. In several districts of Uttar Pradesh and Haryana, school administrations pre-emptively announced schedule changes or temporary closures.

Causes Behind the Extreme Fog Layer

Meteorologists attribute the current fog formation to a combination of factors typical of North India’s winter climate: plunging night temperatures, high moisture content in the air, and reduced wind speeds that prevent dispersal of suspended water droplets. Additionally, smoke and industrial pollutants lingering in the air create particulate matter on which moisture condenses, intensifying fog density.

Air quality monitors recorded persistently high levels of particulate pollution in Delhi and surrounding NCR districts. Experts warn that fog mixed with pollutants can worsen respiratory issues, especially among vulnerable populations such as the elderly, young children, and individuals with asthma or cardiovascular disease. Government health advisories urge residents to wear protective masks when stepping outdoors and to use air purifiers indoors wherever possible.

Transport Sector Hit Hard

Aviation authorities issued multiple advisories requesting passengers to check flight status before travelling to airports. Several airlines extended rescheduling waivers for passengers affected by delays or cancellations. Travelers arriving in Delhi, Lucknow, and Amritsar airports described scenes of long queues, confused passengers and repeated announcements regarding weather-related disruptions.

On the roads, expressways witnessed unusually slow traffic movement as authorities deployed additional patrol vehicles and electronic messaging displays warning commuters. The fog delayed scheduled bus services across inter-state routes, particularly between Delhi and Uttar Pradesh.

Indian Railways, too, announced widespread disruptions. Several passenger trains arrived hours behind schedule as they navigated poor track visibility and safety restrictions. Fog-safe speed limits were imposed across major routes connecting North Indian cities.

Public Health and Safety Concerns

Environmental health experts pointed out that cold and foggy conditions could worsen already deteriorating winter air quality in the region. Prolonged exposure to such fog can irritate the throat and eyes, aggravate bronchial issues, and contribute to winter viral infections. Medical professionals recommended avoiding early morning walks, keeping homes well ventilated, and maintaining adequate hydration.

Several state governments advised citizens to take precautionary measures while travelling. Officials encouraged commuters to maintain safe vehicle distances, use fog lamps, and avoid overtaking on highways. The death toll from road accidents often increases during dense fog periods, prompting emergency responders to remain on high alert.

Economic Impact Likely

With thousands of passengers stranded or delayed, logistics and business sectors braced for a ripple effect. Weather disruptions at airports often affect cargo flights as well, delaying supply chains. Perishable agricultural produce transportation also took a hit in agrarian states like Punjab and Haryana. Industry analysts suggested that if fog persists for more than a week, overall logistics costs and business disruptions could escalate sharply.

Cold wave conditions may also impact farm operations. Wheat-sown fields rely on sunlight and predictable dew cycles. Prolonged fog reduces sunlight exposure and may affect crop yields, especially for late-sown crops.

Authorities Prepare for Extended Fog Conditions

Meteorological forecasts indicated that dense fog would likely continue for the next several days, especially in the early morning and late evening hours. Daytime temperatures are expected to remain below seasonal averages. Government agencies across Delhi NCR and neighbouring states intensified preparedness efforts, including visibility monitoring, advisories to schools, and deployment of traffic police at vulnerable intersections.

Electricity consumption spiked as households relied heavily on heating appliances. Officials urged consumers to conserve power and avoid overloading circuits to prevent outages.

Conclusion

The extreme fog gripping North India has led to widespread travel disruptions, health concerns, and economic consequences. With authorities issuing red alerts across Delhi, Uttar Pradesh, Punjab, and Haryana, citizens are urged to exercise caution and stay updated on weather advisories. While winter fog is a recurring feature for the region, this year’s dense blanket, coupled with severe air pollution and cold wave conditions, could intensify hardships for millions over the coming days.