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  1. 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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  2. 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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  3. View of Antarctic sky from NSF/NCAR HIAPER research jet

    Where's the atmosphere's self-cleaning power?

    In a surprising finding, a research team concludes that the dominant "detergent" in the atmosphere is equally abundant in the northern and southern hemispheres.

    • Air Quality

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  4. Ground-level ozone's toll: A traffic jam in Delhi, India

    Ground-level ozone's toll in India

    Ozone pollution in India is damaging millions of tons of the country’s major crops, according to a new study by an international team of researchers. The pollution caused losses of more than $1 billion in a single year, destroying enough food to feed an estimated 94 million people.

    • Air Quality

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  5. Trash burning and air pollution: open trash fire in General Santos, Philippines

    Trash burning worldwide significantly worsens air pollution

    An estimated 40 percent of the world's waste is burned in unregulated fires, emitting pollutants that can harm human health and the environment.

    • Air Quality

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