Overall air quality in the national capital continued to be in the 'very poor' category on Saturday. In Anand Vihar, the Air Quality Index (AQI) entered the 'severe' category with PM 2.5 at 473 and PM 10 at 464, while the CO was at 119, in 'moderate' category with NO2 at 69, in 'satisfactory' levels, as per the Central Pollution Control Board (CPCB) at 9 a.m.