2. San Antonio-New Braunfels, TX
Even though San Antonio is ranked 19th for the ozone, it is on the other hand 1st on the list for the cleanest metropolitan areas in the country for 24-hour particle pollution. Moreover, it is 107th on the list for annual particle pollution out of 184 metropolitan area. A number of people with lung cancer is significant, but the number of adult asthma is much bigger — 134,762.
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