India's capital city of Delhi has virtually shut down as air pollution hit "severe plus" levels, according to Indian government officials in its pollution control authority.

Lahore recorded the highest number of air pollution-related cases, with 5,353 individuals seeking hospital treatment for respiratory issues, including 359 asthma patients, 171 with heart disease, 20 stroke victims,

Despite the recurrence of extreme pollution episodes and their very high health costs, the authorities are not taking any structural measures.

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 battles air pollution every winter as cold,

Delhi recorded air pollution more than 17 times above an acceptable level as worsening smog triggered curbs on trucking and shuttered construction sites and schools.

Delhi's 24-hour AQI, recorded at 4 pm daily, stood at 441, data from the Central Pollution Control Board (CPCB) showed.