U.S. Air Quality Slips After Decades of Improvement

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Manage episode 236427784 series 1264050
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After decades of improvement, America's air may not be getting any cleaner. Over the last two years the nation had more polluted air days than just a few years earlier, federal data shows. While it remains unclear whether this is the beginning of a trend, health experts say it's troubling to see air quality progress stagnate.

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