Here are the six cities with the cleanest air in America

Exceptionally clean air is hard to come by in the US. Between emissions from power plants, cars, and trucks; oil and gas drilling; wildfires; and agricultural pollution, most major American cities have their share of days when their air is polluted at unhealthy levels. Some have it much worse than others.

But in its State of the Air report released Tuesday (April 19), the American Lung Association identified a selection of cities that did not log a single bad-air day at all between 2013 and...

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