Delhi's air quality declined once again, falling into the ‘poor’ category with an Air Quality Index (AQI) of 209, said the India Meteorological department (IMD).

AQI remains moderate at 161 at 6 am on Monday. Fresh western disturbance to show impact starting from February 24th.

many countries have adopted an air quality index or AQI — a numerical scale where larger numbers mean worse air. They are also often assigned different colors to show whether the air is clean or ...