Connecticut Department of Energy & Environmental Protection

DEEP headquarters at 79 Elm Street in Hartford is currently closed due to recent water damage impacting multiple areas of the building. We are working to remediate the situation and get the building back open to staff and the public as soon as possible. While the building is closed, Staff continue to work either remotely or in alternate locations. We continue to be able to receive documents via U.S. Mail or courier service, and our electronic file submittal protocols remain unchanged. For updates, please click here

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 https://sft.ct.gov/, which can be accessed by entering the following credentials:

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