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Available Products/Tools
Methods
- Federal Reference Methods - EPA Federal Reference Methods (FRM) are used to measure compliance with National Ambient Air Quality Standards (NAAQS) for criteria air pollutants. ORD conducts research to develop and evaluate methods as potential FRMs. Details of Federal Reference Methods
Models
- Positive Matrix Factorization 3.0 (EPA PMF 3.0) - EPA PMF is a receptor model being developed and freely distributed by ORD. The model uses ambient measurements and estimated uncertainties in those measurements to infer emission sources likely impacting a monitor and by how much. The solution is based on a constrained weighted least squares approach. The software has a graphical user interface (GUI) that makes entering data and viewing modeling results easy. The current versions of EPA PMF (versions 1.x) solve the relatively simple bilinear model. Details of Positive Matrix Factorization 3.0
- Unmix 6.0 - EPA Unmix is a receptor model that is freely distributed by ORD. The model uses ambient measurements to determine the number of source types and their impacts at a monitoring site. The Unmix algorithm is based on defining feasible solution space for the input data. This space is derived using edges or sample groups with relatively low impacts. These edges define source types which account for the majority of variability in the data. The software has a graphical user interface (GUI) that makes entering data and viewing modeling results easy. Details of Unmix 6.0
- Exposure Related Dose Estimating Model (ERDEM) - ERDEM is a physiologically-based pharmacokinetic (PBPK) model with a graphical user interface (GUI) front end. Such a mathematical model was needed to make reliable estimates of the chemical dose to organs of animals or humans because of uncertainties of making route-to route, low-to-high exposure, and species-to-species extrapolations when there are exposures to one, or to multiple chemicals. Details of Exposure Related Dose Estimating Model
Databases
- Human Exposure Database System (HEDS) - an integrated database system that contains chemical measurements, questionnaire responses, documents, and other information related to EPA research studies of the exposure of people to environmental contaminants. Details of Human Exposure Database System
- Consolidated Human Activity Database (CHAD) - contains data obtained from pre-existing human activity studies that were collected at city, state, and national levels. CHAD is intended to be an input file for exposure/intake dose modeling and/or statistical analysis. Details of Consolidated Human Activity Database
Reports
- Atmospheric Sciences and Exposures
- Human Exposures
Publications
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