India's most polluted: 4 NCR cities breathed worst air in Jan

Four NCR cities, including Ghaziabad, Delhi, Noida, and Gurgaon, dominated India's pollution rankings in January. Fine particulate matter (PM2.5) consistently remained in 'very poor' to 'severe' ranges, with Gurgaon's air nearly ten times dirtier than WHO's safe limit. This persistent winter smog highlights a critical air quality challenge across the region.