Just how dirty is the air you breathe? The American Lung Association has released its latest list of the most polluted U.S. cities.
Just how dirty is the air you breathe? The American Lung Association's annual report of the most polluted cities in the U.S. rates communities on levels of ozone, sulfur dioxide, air-borne particulates and tainted tap water. Here are the 20 cities most polluted by year-round particle pollution:
U.S. Air Force
Vivaldi and Bach die, the first hamburger is sold in the U.S., World War I breaks out, a bomber crashes into the Empire State Building, and the Summer Olympics open up in Los Angeles, all on this day.