Among the delayed services were notable trains such as the Goa Express, Poorva Express, Kalindi Express, and the Rewa-Anand Vihar Terminal SF Express

The dense fog also affected rail travel, with at least 20 trains to Delhi running late. Visibility in the city was recorded at a mere 100 meters at 5:30 am.

A thick layer of fog covered Delhi on Christmas morning as the air quality remained 'very poor'. The low visibility affected flights at the Delhi airport. The weather department has issued a yellow alert for Wednesday and warned of dense fog in the early morning hours.

Delhi airport has issued an advisory warning of possible flight disruptions due to low visibility caused by fog. Non-CAT III compliant flights may exp

In a statement on social media, the Delhi airport confirmed that while landings and takeoffs were ongoing, flights not equipped with CAT III navigation systems could face disruptions

The Delhi Airport on December 25 has issued an advisory informing passengers that flights not compliant with Category III (CAT III) may experience disruptions due to fog. The airport has urged travelers to contact their respective airlines for the most up-to-date information on flight statuses.

Despite the heavy fog, commuters remained patient as train delays and flight disruptions affected travel across Delhi.

CAT III, or Category III, is an approach system that allows flights to land safely during poor visibility conditions