1. Houston-The Woodlands, TX
On the top of our list of the most polluted cities in the US in 2017 is Houston-The Woodlands! Besides our ranking, Houston-The Woodlands is ranked 49th for 24-hour particle pollution out of 186 metropolitan areas and 16th for annual particle pollution out of 184 metropolitan areas. Moreover, there is a huge number of people with adult asthma (382,312) and 3,705 with lung cancer.
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