A day after the Supreme Court-mandated anti-pollution authority declared public health emergency in Delhi-NCR, the air quality index registered yet another ‘severe’ Delhi day on Saturday. Major pollutants PM 2.5 at 500 and PM 10 at 500 remained in 'severe' category in Lodhi Road area, according to the Air Quality Index data. Neighbouring Ghaziabad was no better with AQI hovered over 450-mark in localities such as Indirapuram and Vasundhara.