We use version 3 of the MOVES (U.S. EPA, 2020a), developed by the U.S. Environmental Protection Agency (EPA), to construct country-specific emission factor look-up tables. Given the extensive computational requirements for modeling annual average daily emissions at the link level across the entire U.S. using MOVES, we develop a streamlined approach. This approach involves selectively running the software for counties that represent unique combinations of model parameters for January and July, similar to the methodology used in the 2017 National Emissions Inventory (NEI) by the U.S. EPA (U.S. EPA, 2021). January and July are chosen to represent winter and summer conditions, with the resulting values averaged. Our study focuses exclusively on primary emissions-those directly emitted-of NOX and PM2.5, and does not address emissions resulting from secondary processes, which involve the atmospheric formation of pollutants.