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 in 2013:
Accused Boston Marathon bomber Dzhokhar Tsarnaev is living in virtual isolation at the Federal Medical Center in Devens, Mass. He is being held with special administrative restrictions reserved for terrorism suspects. It prevents him from having contact with others held in the facility.