7. Fresno-Madera, CA
Among the top worst cities when it comes to air pollution is Fresno-Madera, the number 7 in our list of most polluted cities in the US in 2017. It is ranked 2nd for 24-hour particle pollution out of 186 metropolitan areas and 3rd for annual particle pollution out of 184 metropolitan areas. As a consequence, there is 489 of those with lung cancer and 62,047 of those with adult asthma.
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