Urbemis 2007 Program

This page last reviewed March 25, 2011

URBEMIS is a computer program that can be used to estimate emissions associated with land development projects in California such as residential neighborhoods, shopping centers, and office buildings; area sources such as gas appliances, wood stoves, fireplaces, and landscape maintenance equipment; and construction projects.  URBEMIS stands for "Urban Emissions Model."

The most recently updated version of the model, URBEMIS, version 9.2.4, can be downloaded at the following site:  http://www.urbemis.com

Contacts: For more information or assistance, please send an e-mail to: http://www.urbemis.com/contact/contact.html
Air Districts: California air district phone numbers, office locations, street, email, website addresses, and maps showing county and air district boundaries are provided at the following website:  /capcoa/roster.htm
Out-of-State Users: Out-of-state users should know that URBEMIS 2007 uses California motor vehicle emission rates, which tend to be lower than those in other states due to California's stricter emission controls.  Therefore, out-of-state users should adjust emission outputs to reflect their vehicle fleets.
URBEMIS 2007 is a user-friendly program that estimates air pollution emissions in pounds per day or tons per year for various land uses, area sources, construction projects, and project operations. Mitigation measures can also be specified to analyze the effects of mitigation on project emissions.
The "Mobile Source Mitigation Component" allows the user to estimate the potential vehicle travel and emission reduction benefits from a number of land use and transportation-related strategies within the project site and in the surrounding area. These strategies include pedestrian and bicycle facilities, public transit facilities and service, the design and mix of land uses, on-site services, and other measures such as telecommuting and alternative work schedules.
The model has special features to minimize "double-counting" of trips in mixed-use projects that include both residential and non-residential land uses and to standardize the estimation of "pass-by" trips (stops made on the way to other destinations). The model uses the Institute of Transportation Engineers' Trip Generation Manual along with the ARB's motor vehicle emissions model, EMFAC, to calculate motor vehicle emissions; however, nearly any assumption can be modified if information is available that is more accurate than the model defaults.

Software -- Utilities and Modeling