Delhi was listed as India's most polluted city Thursday as a weeks-long air quality crisis gripping northern India has shown few signs of letting up.

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,

Residents of the national capital breathed in despair on Saturday, with the air quality plunging back to the 'severe' category as average Air Quality Index (AQI) pegged at 412.

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),

A thick layer of smog engulfed the national capital on Friday while the air quality index in Delhi remained in the 'very poor' category, according to the Central Pollution Control Board (CPCB). Drone visuals from the Mayur Vihar and Kalindi Kunj areas revealed the thick density of smog.