Dense Fog Grips Delhi-NCR, Disrupts Flights; AQI Remains "Very Poor"

• Dense fog on December 31 severely reduced visibility in Delhi-NCR, disrupting air traffic at Indira Gandhi International Airport.
• Delhi's overall AQI stood at 384 ("very poor"), with several areas like Anand Vihar and ITO recording "severe" levels.
• Delhi Airport is operating under CAT III conditions, leading to potential flight delays and cancellations; ground staff deployed for assistance.
• IndiGo issued advisories for Delhi and other northern airports, warning of slower operations due to low visibility.
• Air India canceled certain morning flights to minimize passenger inconvenience, with potential cascading delays across its network.

Why It Matters: Dense fog and "very poor" AQI cause major flight disruptions in Delhi-NCR; airlines issue advisories.