The emissions inventory group at Alpine Geophysics provides state of science emissions modeling for air quality studies. Alpine staff have demonstrated experience in all of the current emission modeling systems, including EMS-95, SMOKE, and EPS. Experiences include urban scale modeling in over a dozen US cities and regional scale modeling throughout the US, as well as portions of Canada, Mexico, and Australia. Emission inventory projects, for both industry and governmental agencies have included inventory development and control strategy implementation for stationary point, stationary ara, non-road mobile source, on-road motor vehicle, and biogenic emission sources.