Delhi, India

Delhi's annual November crisis pushes AQI past 500, the 'hazardous' threshold, but the average winter PM2.5 of 250 µg/m³ is 30% lower than Lahore’s peak — though still 10 times the WHO guideline. Agricultural stubble burning, vehicle exhaust, and construction dust combine to blanket the capital for weeks, causing 17,000 excess respiratory deaths per year.