Delhi's air quality remains in 'poor' category

Air Quality Index is in 'poor' category in various parts of Delhi as per Central Pollution Control Board (CPCB) data.

Thick layer of smog enveloped parts of Delhi on November 23.

Burning crop residue is one of the major causes of air pollution in parts of north India.

In order to combat pollution, Delhi government recently launched, 'Green Delhi' application.