While Delhi’s pollution debates often centre around PM2.5, a more immediate and overlooked threat is rising in the city’s air: nitrogen dioxide (NO₂). Yes, it comes from rush hour traffic. It remains a major air quality challenge, regularly surpassing WHO limits and impacting the respiratory system through inflammation, coughing, wheezing, reduced lung function and higher infection risk.

The city’s dense traffic, particularly around major roads, intersections and the airport, is the primary source, pushing concentrations to two or three times recommended levels. These elevated NO₂ readings worsen the overall AQI and make precautions such as wearing masks or limiting time outdoors advisable, even during periods when other pollutants like PM2.5 fluctuate.

A Centre for Science and Environme

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