According to a report published this week by the American Lung Association, almost half of Americans – 137 million people – are experiencing more days of "very unhealthy" and "hazardous" air quality than in the previous two decades combined.
The Lung Association's State of the Air report also revealed that 72 million people of color live in counties that received at least one failing grade for ozone and particle pollution.
More than 14 million dwell in areas where health officials doled out failing grades on all three measures.
The report looks at America's exposure to two types of air polluti...
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