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

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.

A 24-hour average Air Quality Index (AQI) of 488 (severe) was recorded at 8am compared to 494 at 4pm on Monday, the joint-second highest ever in the Capital

Delhi ’s government imposed the most stringent set of restrictions on the movement of vehicles and people as the toxic smog enveloping the Indian capital worsened on Monday. The city’s average air quality index was 457 in the morning,

Delhi's air quality has plunged to "severe-plus," triggering GRAP IV restrictions and impacting travel. Flights and trains are experiencing delays and cancellations due to low visibility. Travellers are advised to stay updated on schedules,