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Before and After: Ohio Valley 2005-2011

Image showing Air Quality in the Ohio Valley, 2005. Image showing Air Quality in the Ohio Valley, 2011.

The impact of technology to reduce emissions of nitrogen dioxide and sulfur dioxide from coal-fired power plants is apparent in satellite imagery, which shows the signal of pollution blink out over time. Still, while air quality is improving, power plant emissions of carbon dioxide – a greenhouse gas – remain an issue.