An Environmental Protection Agency RadNet (radiation network) monitor is shown on the roof of the Bay Area Air Quality Management building in San Francisco, Wednesday, March 16, 2011. Federal ... more 
An Environmental Protection Agency RadNet (radiation network) monitor is shown on the roof of the Bay Area Air Quality Management building in San Francisco, Wednesday, March 16, 2011. Federal environmental regulators say they are adding more radiation monitors in the western United States and Pacific territories as concerns rise over exposure from damaged nuclear plants in Japan. (AP Photo) less 
1 / 1
Associated Press
Wed, Mar 16, 2011 8:46 PM EDT