![[logo] US EPA](https://webarchive.library.unt.edu/eot2008/20090510015257im_/http://www.epa.gov/epafiles/images/logo_epaseal.gif){kind=logo}
EPA Positive Matrix Factorization (PMF) 3.0 Model
You will need Adobe Acrobat Reader, available as a free download, to view some of the files on this page. See EPA's PDF page to learn more about PDF, and for a link to the free Acrobat Reader.
Receptor models provide scientific support for current ambient air quality standards and for implementation of those standards by identifying and quantifying contributions for source apportionment. Ambient air quality data sets have been improving greatly due to more species being measured, species being stratified by particle size, and shorter durations of sampling. Receptor model algorithms have also improved greatly to take advantage of these higher quality data sets.
To ensure that receptor modeling tools are available for use in the development and implementation of air quality standards, the United States Environmental Protection Agency's Office of Research and Development (ORD) has and continues to develop a suite of receptor modeling tools that are freely distributed to the air quality management community.
EPA PMF is one of the receptor models that ORD has developed. The user provides a file of sample species concentrations and uncertainties which the model uses to calculate the number of sources types, profiles, relative contributions, and a time series of contributions. The algorithms used in EPA PMF model to compute profiles and contributions have been peer reviewed by leading scientists in the air quality management community and have been certified to be scientifically robust. The PMF 3.0 Fundamentals & User Guide provides details on how PMF is implemented as well as references.
EPA PMF software program is a stand-alone product, meaning that it requires no other software and is self-contained. There is no need for a license and the program is available free of charge. The software is menu-driven, using Graphical User Interfaces, and therefore eases inputting of data, generating, evaluating, and exporting of results.
System Requirements:
The EPA PMF 3.0 model works on Windows XP and Windows Vista. The computer should have at least a 2.0 GHz processor and at least 1 GB of memory. In addition a 800x600 pixel display is recommended.
IMPORTANT: PLEASE REGISTER FIRST (link below) before performing the download.
Registration Form
Comments or questions on EPA PMF 3.0 or problems with the download should be sent to NERL_RM_Support@epamail.epa.gov. We welcome comments that can be considered for future development.
Product available for download:
EPA PMF 3.0 Software (57.6 MB)
EPA PMF 3.0 Fundamentals & User Guide (PDF, 81 pages, 3.7 MB)
The U.S. EPA is currently working on EPA PMF 3.1. This version will incorporate a method to move low contribution or edge points to zero and use them to refine the solution. The updated version will be posted here some time in the near future. Please refer back to this website periodically to ensure that the most recent version of the model is used in your applications. Thank you.
NERL RM Support Team