Source: AQI numbers from Environmental Protection Agency. Air Pollution Index is based on the incidence of airborne lead, NO2, particulate matter, carbon monoxide and ozone depletion.
Using statistics from data provider Onboard Informatics, we crunched the numbers in order to zero in on America's best small cities for families. (Last year, we looked at small towns, with populations between 8,500 and 50,000.)
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