Residents in India's northern states woke up to another day of poor air quality on Tuesday, as a layer of dense fog shrouded most of the region, and pollution in the capital Delhi remained severe.

India's capital region of Delhi has virtually shut down as air pollution hit "severe plus" levels, according to Indian government officials in its pollution control authority Delhi's Chief Minister Atishi Marlena said that all of northern India was in the middle of a "medical emergency.

Around 38% of the pollution in New Delhi this year has been caused by stubble burning - a practice where stubble left after harvesting rice is burnt to clear fields - in the neighbouring states of Punjab and Haryana, according to SAFAR, a weather forecasting agency under the ministry of earth sciences.

Many of the regulars at Lodhi Garden in New Delhi, one of the world’s most polluted cities, say they won’t let rising pollution levels deter their daily visits.

Delhi's new action plan to combat rising pollution includes a ban on non-essential trucks, school closures, and remote work.