India, Dec. 15 -- Delhi woke up to yet another winter morning wrapped in thick smog on Monday, as air quality stayed firmly in the 'severe' category across the national capital for the third consecutive day.

The overall Air Quality Index (AQI) stood at 457 at 6 am, data from the Air Quality Early Warning System for Delhi showed, with visibility dropping sharply in several pockets of the city.

The dense haze was visible across Delhi, making it difficult to see even a short distance ahead. Flights from the national capital were also likely to be impacted, with both the airport and airlines issuing advisories as visibility conditions worsened.

The situation worsened over the weekend, with air quality deteriorating sharply on Monday. At le...