Delhi is under a red alert as dense fog blankets the city, causing severe disruptions to air and rail traffic. The Air Quality Index (AQI) has soared past 400, landing in the "Severe" category and posing significant health risks to residents.

Visibility has been drastically reduced, with the Indira Gandhi International (IGI) Airport operating under CAT III conditions. This has led to numerous flight delays, diversions, and cancellations, leaving passengers stranded and airlines scrambling to manage the chaos. Several airlines, including IndiGo and Air India, have issued travel advisories, urging passengers to check their flight status and allow extra time for travel. IndiGo has also offered options for rebooking or refunds through their "Plan B" initiative. Delhi Airport has also issued advisories, with ground teams assisting passengers.

Train services have also been severely affected, with many trains running hours behind schedule due to the low visibility. Commuters are advised to stay updated on the conditions and exercise caution while traveling.

The Central Pollution Control Board (CPCB) has reported an AQI of 459, categorizing it as "Severe". This level of pollution can seriously impact respiratory health, especially for children, the elderly, and those with pre-existing conditions. The toxic smog has enveloped the city, exacerbating the already challenging weather conditions.

The India Meteorological Department (IMD) had issued an orange alert, warning of continued foggy conditions that could further disrupt transport services. According to the Air Quality Early Warning System (AQEWS), the air quality is expected to remain in the "very poor" category in the coming days. The IMD had earlier issued a yellow alert for dense fog and cold wave-like conditions. Experts have pointed out that these weather conditions lead to low wind speeds, preventing the dispersal of pollutants and keeping AQI levels elevated.