Several city neighbourhoods recorded AQI levels above 200. It prompted the use of anti-smog guns to control road dust.
Delhi-NCR is under GRAP Stage 1 restrictions to control pollution, including limits on diesel generator use and bans on coal and firewood in restaurant tandoors.
Thick layers of hazardous toxic foam coated the Yamuna River at Kalindi Kunj on Saturday morning as air quality deteriorated further across Delhi-NCR.