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The transportation sector faces great and urgent challenges, including climate impacts of greenhouse gas emissions, local health impacts of criteria pollutants, and political & economic impacts of petroleum dependence. While several revolutionary solutions are being developed to reduce the impact of motor vehicles, such as increased fuel economy standards and accelerated adoption of hybrid vehicles, revolutionary new approaches must also be evaluated. One such opportunity is found in Compressed Air Engine (CA Engine), which is powered solely by compressed air stored in a vehicle on-board pressurized tank. Proponents of this technology claim CA Engines are greener and cheaper to operate, since they do not consume fossil fuels and produce zero tail-pipe emissions, while offering the power and performance needed for light-duty vehicle use.