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Model Report


Last Revision Date: 08/25/2009 View as PDF
General Information Back to Top
Model Abbreviated Name:

Model Extended Name:

Model Overview/Abstract:
MCCEM is a sophisticated and flexible indoor air model that can be used to estimate concentrations and exposures in an indoor environment that has up to four zones. The major inputs are zone volumes, inter-zonal air flows, and air exchange with the outside (a library of homes is included in the model from which the user can choose). Other major inputs are source emission rates, sink rates and occupant activity patterns.
Model Technical Contact Information:
Christina Cinalli
U.S. EPA (Mail code: 7406M)
Washington DC 20460
(202) 564-8542

The model was developed by Michael Koontz (Versar/GEOMET Technologies) and is maintained by the U.S. EPA, Office of Prevention and Toxics (OPPT), Economics, Exposure, and Technology Division (EETD).

Model Homepage: http://www.epa.gov/oppt/exposure

User Information Back to Top
Technical Requirements
Computer Hardware
Minimum: 486 PC with 16 KB RAM and 6.7 MB ROM
Compatible Operating Systems
Windows 95, 98, or later
Other Software Required to Run the Model
C or C+
Download Information
The model is publicly available from the U.S. EPA, Office of Prevention and Toxic Substances (OPPT), Economics, Exposure and Technology Division (EETD). http://www.epa.gov/oppt/exposure/
Using the Model
Basic Model Inputs
More complex model with greater input requirements, but no substantial modular or sub-model components.
User Support
User's Guide Available?

Documentation is available through the help screen provided with the downloadable model software.

(1) an abstract or abstract equivalent in the introduction,
(2) equations, equation solution methodologies, and related simplifying assumptions,
(3) example input/output files,
(4) input and output variable documentation including definitions, units, temporal/spatial dimensions, temporal/spatial resolution options, and (if applicable such as with FORTRAN) format,
(5) guidance on selecting and/or estimating values and/or distributions for input variables (including guidance on calibration and selecting default values and/or distributions),
(6) guidance on the analysis and interpretation of output, and
(7) description of sensitivity analysis, uncertainty analysis, and testing (validation) methodologies and results.

Model Science Back to Top
Summary of Model Structure and Methods
The model uses fixed units

Governing equations are solved numerically.

MCCEM has a built-in Monte Carlo Routine for indoor concentrations and exposures.

Model Evaluation

Substantial model testing (evaluation) has been performed. Model results have been compared to tracer gas studies and indoor concentration studies from the use of consumer products. Tracer gas studies are available as a contractor report. The results of the consumer product comparisons have been published.

Results of sensitivity analysis are available in a contractor report.

The model has been externally peer reviewed

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