Border pollution measures (BPMs), which place a fee on imports based on the emissions intensity of the imported goods, are intended to reduce greenhouse gas (GHG) emissions, increase U.S. manufacturing, and generate U.S. government revenue. This report examines the economic and environmental impacts of a U.S. BPM on steel and aluminum to determine the extent to which such a policy would achieve these goals. The report includes four main scenarios that each cover a different fee (applied to the difference in emissions intensity between imports and domestic production) as well several scenarios with variations in policy designs.