Dense fog has returned to northern and eastern India, significantly reducing visibility in regions including Delhi and Uttar Pradesh. This has led to disruptions in road, rail, and air travel, with flight delays reported at major airports like Delhi and Guwahati. The fog has impacted iconic landmarks such as the Taj Mahal and Ayodhya Ram Mandir. While Delhi Airport's CAT-3 system can manage low visibility, some flight delays and cancellations are still anticipated.