8. Visalia-Porterville-Hanford, CA
Up next in our list of most polluted cities in the US in 2017 is Visalia-Porterville-Hanford, which is ranked 2nd for 24-hour particle pollution out of 186 metropolitan areas, while 1st for annual particle pollution out of 184 metropolitan area. In addition, this area has a total of 265 people who are dealing with lung cancer and 32,578 who suffer from adult asthma.
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