Dense fog significantly disrupted flight operations at Delhi's Indira Gandhi International Airport on Tuesday, leading to the cancellation of at least 118 flights and diversion of 16, with over 130 services delayed. Visibility dropped to critical levels, impacting CAT III compliant flights. Airlines issued advisories, and the Civil Aviation Ministry directed compliance with passenger facilitation norms. Air quality remained a concern, largely in the 'very poor' to 'severe' categories. Operations gradually normalized as visibility improved later in the day.