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Last Updated: Friday, February 22, 2013 10:03 AM
CT-EMFAC is based on EMFAC 2007, which was replaced by EMFAC 2011 for non-conformity-related studies when the new EMFAC version was released on September 30, 2011. Do not use CT-EMFAC for new environmental studies started after that date other than for conformity purposes. EMFAC 2007 (and CT-EMFAC, which is based on it) continues to be used for
CT-EMFAC is an interpretation of the California Air Resource Board's EMFAC 2007 model (more EMFAC information) that simplifies the process of developing composite emission factors for highway project air quality analysis. It also extends EMFAC to include EPA's 2007 priority mobile source air toxics (with use of an Excel spreadsheet), which require off-model speciation of Total Organic Gases (TOG) when the standard EMFAC model is used.
CT-EMFAC was developed in consultation with ARB staff, and can be used in place of the full EMFAC 2007 model when the detailed fleet and other planning assumptions used by EMFAC are not available or not needed. Typical use would be to develop composite emission factors for running CALINE4 using Appendix B procedures from the CO Protocol, or for basic emission analysis of a highway project.
CT-EMFAC 4.1 includes the following major items that were not in the version (2.6) previously available at this site:
- Improved user interface allowing placement of input and output files in any user-accessible folder;
- Ability to analyze multiple road segments in a "batch"; and
- Method to develop emission estimates (in some cases using a spreadsheet) for EPA's 2007 MSATs and diesel particulate matter (2.6 only produced emission estimates for the 2001 MSATs and diesel particulate matter)
- Ability to work under both 32- and 64-bit Windows 7 (CT-EMFAC.exe dated 7/28/2011 or later)
A "Databridge" tool is also available to help format link-based travel data for use with the batch mode of CT-EMFAC 4.1. This tool is a "beta" product and could contain errors or inconsistencies - if you discover problems please let us know.
CT-EMFAC requires .NET 2 or higher runtime support. and Windows XP or later, this requirement is normally met because .NET 2 or higher ships with those operating systems. .NET versions up to 3.5 should work; version 4 and later may not support all features of .NET 2 and CT-EMFAC has not been tested with it. Multiple versions of the .NET runtime can be used side-by-side on one computer.
CT-EMFAC also depends on the Microsoft Data Access Components (MDAC) 2.8 or later. Windows 7 and later provides MDAC or equivalent data access components as part of the operating system. If they are missing in an earlier Windows version, MDAC (32-bit/x86 only, Windows XP) can be downloaded from Microsoft .
Administrator access to the computer is required to install or upgrade .NET and, if missing, the data access components. CT-EMFAC itself does not normally require administrative rights to install or use, as long as it is not placed in the "Program Files" folder or some other restricted-access location. Create a new folder at a convenient location in your computer where the user has full (read/write) access, then extract all the files in the ZIP archive to it.
CT-EMFAC, after installation, uses about 600 megabytes of disk space.
- Full Package, Version 4.1 (112 MB ZIP archive file; CT-EMFAC.exe dated 7/28/2011)
(includes spreadsheet template supporting napthalene & POM analysis)
- Readme file, Version 4.1 (Text; included in the full package)
- Databridge tool (beta product) - consult the help file included in the zip file for usage instructions