For years it was ignored. Now scientists say this gas may be the major contributor to air pollution

Urban air pollution science has uncovered a surprising shift. A long-ignored gas, nitric oxide, may influence aerosol particle formation in cities. New atmospheric research shows that pollution chemistry is far more complex than expected. This discovery challenges old air quality models and explains why predicting particulate matter, climate impact, and urban pollution levels remains difficult despite decades of study.

Raccontata daeconomictimes.indiatimes.com