This April 15,2013 photo shows the hazy skyline of Los Angeles seen 

This April 15,2013 photo shows the hazy skyline of Los Angeles seen from Mount Wilson, Calif., Monday, April 15, 2013. A mile above this city, sensors gaze down on the basin from atop Mount Wilson the way a satellite fixates on Earth, collecting pieces of information about Los Angeles' carbon footprint. (AP Photo/Jae C. Hong)
Associated Press
This April 15,2013 photo shows the hazy skyline of Los Angeles seen from Mount Wilson, Calif., Monday, April 15, 2013. A mile above this city, sensors gaze down on the basin from atop Mount Wilson the way a satellite fixates on Earth, collecting pieces of information about Los Angeles' carbon footprint. (AP Photo/Jae C. Hong)
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