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:
The San Francisco Giants defeated the Kansas City Royals 3-2 last night to win the 2014 World Series, but the night's celebration quickly turned violent. Take a look at images of the chaotic scene in San Francisco.