Report: Most Americans in areas with unhealthy air

(AP) -- Sixty percent of Americans live in areas with unhealthy air pollution levels, despite a growing green movement and more stringent laws aimed at improving air quality, the American Lung Association said in a report ...

Pollution dims skies as well as befouling the air

A University of Maryland-led team has compiled the first decades-long database of aerosol measurements over land, making possible new research into how air pollution changes affect climate change.

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