Multimedia Gallery
January 14, 2011
Images credited to the National Science Foundation, a federal agency, are in the public domain. The images were created by employees of the United States Government as part of their official duties or prepared by contractors as "works for hire" for NSF. You may freely use NSF-credited images and, at your discretion, credit NSF with a "Courtesy: National Science Foundation" notation.
Additional information about general usage can be found in Conditions.
A coal power plant in Xian, China releases sulfur dioxide directly into the atmosphere.
China's carbon dioxide emissions are ranked number one in the world and only about 4 percent of China's cities have a highest air quality rating. Here, a coal power plant in Xian, China does not have air pollution control devices such as sulfur dioxide scrubber systems. It releases sulfur dioxide directly into the atmosphere.
Credit: Steve Lonker
Images credited to the National Science Foundation, a federal agency, are in the public domain. The images were created by employees of the United States Government as part of their official duties or prepared by contractors as "works for hire" for NSF. You may freely use NSF-credited images and, at your discretion, credit NSF with a "Courtesy: National Science Foundation" notation.
Additional information about general usage can be found in Conditions.
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