The Supreme Court will on Monday decide whether to continue with the Stage 4 emergency measures under the Graded Response Action Plan (GRAP). The measures were introduced to tackle Delhi's severe air pollution.

Hundreds of millions of Indians breathe some of the world’s most toxic air all year round. Air pollution in the capital area that’s home to about 30 million people is especially stubborn. In winter, the cold weather actually makes the smog even worse — and potent.

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.

The AQI in Anand Vihar was recorded as 457; the AQI in Ashok Vihar was 455; Chandni Chowk's AQI was 439 and RK Puram recorded an AQI of 421.

With the overall Air Quality Index (AQI) reading 422 at 6 AM on Saturday, Delhi was once again engulfed in a dense layer of poisonous haze as the air quality fell into the "Severe" category. According to the Central Pollution Control Board (CPCB),

People in Delhi woke up to a hazy morning with a minimum temperature of 11.3 degrees Celsius as the air quality remained in the "very poor" category recording an overall AQI of 373. Out of 38 monitoring stations in the city,

The Central Pollution Control Board data shows of the 38 monitoring stations in Delhi, nine reported AQI readings in the “severe” range.