India, Dec. 22 -- Delhi's air quality stayed 'very poor' on Monday, even as dense fog was recorded in the national capital. Visibility dipped to 150 metres at Palam between 7.30am and 8.30am as over 150 flights were delayed at the Indira Gandhi International (IGI) airport. Several trains were also running late, officials said.

On Sunday, over 500 flights were delayed while at least 107 were cancelled as a thick layer of fog stretched across the northern plains. Satellite imagery showed a similar impact on Monday, with visibility dipping to zero at multiple locations in north India.

IMD data showed that between 7.30am and 8.30am, zero visibility was recorded at Amritsar, Bathinda, Halwara, Kanpur, Ayodhya, Bareilly and Jabalpur. It was 5...