#18: 67212 in Wichita, Kansas
"Wichita is an attractive destination for those who like spending time outdoors. The city’s air quality is 21% better than the national average, and its pollution index is 95% better than the national average."

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http://www.businessinsider.com/hottest-zip-codes-america-2017-10/#19-san-antonio-texas-78247-2