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  1. Tracking soot across Asia: Photo of smog over South Delhi

    What's driving soot across India?

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

    • Air Quality,
    • Weather

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  2. Forecasting air quality: photo of Los Angeles in summer smog

    A heads up on air quality

    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.

    • Air Quality

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  3. Air quality in WINTER: Map highlighting research areas for WINTER field campaign

    Cold facts of air pollution

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

    • Air Quality

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  4. Thunderstorms and ozone:  A rotating supercell thunderstorm moves across northeast Colorado.

    Not just rain: thunderstorms also pour down ozone

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

    • Climate,
    • Air Quality

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  5. Ozone concentrations above the Arctic in March 2011

    Chlorine makes a comeback

    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.

    • Air Quality

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