delhi aqi: Delhi blanketed by toxic haze, world's most polluted city again
Delhi experienced a severe dip in air quality as the air quality index reached 640 in the "hazardous" category, making it the most polluted city in the world followed by 335 in the Pakistani city of Lahore. Crop stubble burning, low wind speeds, and cold temperatures contributed to the spike in air pollutants. The situation prompted school closures and widespread health concerns.