Energy efficiency holds significant pollution reduction potential for states. It can help states to manage air quality, protect public health, and keep electricity affordable, all while growing the local economy. The health benefits of reducing pollution through energy efficiency extend throughout the United States. However, the complexity of the electric grid, the location of power plants, wind patterns that carry pollution from one place to another, and many other factors influence where energy efficiency’s greatest health benefits will be realized. This series of fact sheets summarizes the avoided health harms and pollution reductions that occur through investing in energy efficiency.