Air quality improves across U.S. - are you breathing easy yet?

June 29, 2014 3:12 AM

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Air quality improves across U.S. - are you breathing easy yet?

NASA images show air quality is improving across the U.S., but tens of millions still live in polluted areas.

(Photo : NASA Goddard's Scientific Visualization Studio/T. Schindler)

Also read: California wildfire almost doubles in size as blazes torch U.S. West

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