If the user is using TRIMMS to obtain emission estimates to be used to conduct a transportation policy evaluation to meet transportation conformity regulations customizing the TRIMMS emission factors following the policy guidance procedure recommended by EPA [32] is strongly recommended. Alternatively, users can contact TRIMMS developers to inquire about a custom version of TRIMMS for their project. One of the major advantages of MOVES over MOBILE 6.2 is the wider range of air pollutants that can be modeled and the level of customization that can be achieved to model a specific area. MOVES also provides estimates of global warming emissions (discussed next) in terms of CO2 equivalent estimates. TRIMMS comes loaded with rates for the following air pollution emissions: