Delhi's air quality remained in the 'poor' category, with AQI readings fluctuating around 240-298, and some areas reaching 'very poor'. Dense fog and smog caused reduced visibility, leading to significant flight delays and impacting daily life. The India Meteorological Department issued a yellow alert for fog and warned of cold wave conditions. Authorities urged citizens to limit outdoor activities, while Republic Day parade rehearsals continued despite the haze. A study indicated a significant portion of Delhi's pollution originates from outside the city.