Mobile Source Emissions Modeling

Necessity for Modeling Mobile Source Emissions

The Clean Air Act (CAA) mandates the regulation of the composition of fuels and emission-control components to control air pollution from mobile sources. Mobile source emission models are used to quantify the extent of air pollution from mobile sources.

The Emissions Inventory Guidance for Implementation of Ozone and Particulate Matter National Ambient Air Quality Standards (NAAQS) and Regional Haze Regulationsdirects that the latest EPA recommended mobile source model, currently the MOtor Vehicle Emission Simulator (MOVES), should be used to determine mobile source emissions.

What Are Mobile Source Emissions Used For?

Connecticut estimates mobile source emissions on a triennial basis as part of the National Emissions Inventory (NEI) and state-specific Periodic Emissions Inventory (PEI) efforts. It is also used in the creation of Motor Vehicle Emissions Budgets (MVEBs) as a part of State Implementation Plans (SIP). The run specifications, input databases, and output databases used to calculate mobile source emission estimates for Connecticut's PEIs are available at, which can be accessed by entering the following credentials:

User ID: deepmovesdown
Password: movesd0wn! (The “0” in down is the number zero)