Research finds that the Indian monsoon transports black carbon pollutants across the country, with levels spiking in densely populated areas.

NCAR and its research partners have received a $1.3 million NASA grant to develop the capability for detailed 48-hour forecasts of ground-level ozone and fine particulate matter.

A major field project in the Eastern United States, supported by NCAR, seeks to better understand air pollution during winter.

Scientists find unequivocal evidence that thunderstorms move ozone from the stratosphere down toward Earth's surface, affecting air quality and climate.

A circulation change has boosted concentrations of hydrogen chloride (HCl), the main reservoir of chlorine in the stratosphere, by several percent over much of the Northern Hemisphere since 2007.