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Air quality is improving across most of the US, but the Mountain West is falling behind

smoggy denver.jpg
Rick Kimpel
/
CC BY-SA 2.0

Many cities across the U.S. have had success lowering harmful ground-level ozone in recent years, but the exception to that trend is in the American West. Just last summer, the Front Range — and Denver in particular — recorded some of the worst air quality levels on the entire planet.

READ MORE: Western Boom Cities See Spike in Harmful Ozone

Colorado Edition spoke to Kaiser Health News environment reporter Jim Robbins, who helped explain this trend.

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