Air quality officials across the United States have a significant—and largely unused—tool for reducing harmful air pollution: energy efficiency. Energy efficiency reduces multiple types of emissions, and generally does so at a cost savings. This brief outlines seven strategies for how air regulators can incorporate energy efficiency into their work. The strategies are based on interviews with state, local, and U.S. federal officials, and are illustrative of a mosaic of efforts that can move energy efficiency forward at the state and local levels.