Delhi's air remained severely polluted for the third consecutive day on Saturday with an Air Quality Index (AQI) reaching 504 in the morning. Microscopic PM2.5 particles, which can lodge deep in the lungs and cause health problems, soared to seven to eight times the government's safe limit of 60 micrograms per cubic metre in multiple locations across Delhi-NCR. (Video credit: Raunaq Lekhi)