Delhi continues to be wrapped in a blanket of smog, with the air quality in the "severe" category for the third consecutive day. With AQI 498, Delhi is the world's second most polluted city, after Pakistan's Lahore with AQI 770 recorded at 7 am. IQAir, a Swiss company, ranks major cities based on Particulate Matter 2.5 (PM2.5) data.
