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 services company Onboard Informatics, we crunched the numbers in order to zero in on America's best small towns for families. (Last year, we looked at small cities, with populations between 50,000 and 300,000.)
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