Delhi's air quality deteriorated significantly on Monday, with areas like Dwarka, Mundka and Najafgarh recording an AQI of 500, the worst this season. The city's overall AQI reached 491, triggering the implementation of the Graded Response Action Plan (GRAP) Stage-IV restrictions in Delhi-NCR. Doctors warned of health risks, urging people to wear N95 masks and avoid outdoor activities. The Supreme Court questioned the Delhi government on its anti-pollution measures and warned against scaling down preventive measures without its permission. Delhi Chief Minister Atishi accused the BJP-led central government of political maneuvering while neglecting stubble burning in states it governs. Meanwhile, the city enforced stricter pollution control measures, including a ban on truck entry and suspension of construction activities. Air purifier sales surged, reflecting the public's concern over the severe air pollution.