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EPA - TTN ATW NATA - Limitations in the 1996 National-Scale Air Toxics Assessment: Uncertainty06-26-2009

First, for each of the sources of uncertainty identified in the section on Components , the uncertainty in that individual parameter or model was assessed quantitatively to ...

http://www.epa.gov/ttn/atw/nata/roy/page15.html (HTML)

Final Report | Probabilistic Modeling of Variability and Uncertainty in Urban Air Toxics Emissions08-17-2009

This range of uncertainty is greater than that for many exposure factors (e.g., inhalation rate for some subpopulations) and implies that uncertainty in emission inventories could be an important contributor to uncertainty in exposures ...

http://cfpub.epa.gov/ncer_abstracts/index.cfm/fuseaction/display.abstr... (HTML)

Supercomputer for Model Uncertainty and Sensitivity Evaluation (SuperMUSE)01-12-2010

"Determining Uncertainty analysis and sensitivity analysis for agency models."

http://www.epa.gov/athens/research/modeling/supermuse/supermuse.html (HTML)

Emissions Factor Uncertainty Assessment12-31-2009

"Describes the statistical analyses used to characterize the uncertainties for categories of emissions factors."

http://www.epa.gov/ttnchie1/efpac/uncertainty.html (HTML)

EPA - TTN ATW NATA - Components of Uncertainty06-26-2009

The uncertainty in the ISCLT2 model has been studied extensively, and this uncertainty was used in the uncertainty analysis for the national-scale assessment ...

http://www.epa.gov/ttn/atw/nata/roy/page13.html (HTML)

Final Report | Quantification of Uncertainty in Air Quality Models Used for Analysis of Ozone Control Strategies09-23-2009

The resulting "posterior" uncertainty estimates reflect both the model's performance and subjective judgments about uncertainties in model parameters and inputs ...

http://cfpub.epa.gov/ncer_abstracts/index.cfm/fuseaction/display.abstr... (HTML)

Search by Uncertainty or Modifying Factors | IRIS | US EPA02-04-2010

Search Scope: The search by Uncertainty or modifying factor allows you to search for composite uncertainty factor values, individual uncertainty factor values, and modifying factor values used to derive RfDs ...

http://www.epa.gov/ncea/iris/isearch_uncertain.htm (HTML)

Search by Uncertainty or Modifying Factors | IRIS | US EPA02-04-2010

Search Scope: The search by Uncertainty or modifying factor allows you to search for composite uncertainty factor values, individual uncertainty factor values, and modifying factor values used to derive RfDs ...

http://www.epa.gov/NCEA/iris/search_uncertain.htm (HTML)

EPA - TTN ATW NATA - Limitations in the 1996 National-Scale Air Toxics Assessment: Uncertainty06-26-2009

This section on Uncertainty considers both model uncertainty and parameter uncertainty, and explains how these were developed and combined for the ...

http://www.epa.gov/ttn/atw/nata/roy/page12.html (HTML)

Uncertainty Analyses of Models in Integrated Environmental Assessments | Funding Opportunities | NCER | US EPA09-11-2009

Within the context of integrated assessments, uncertainty may be typified as follows: stochasticity, parameter uncertainty, structural uncertainty, and transboundary uncertainty ...

http://www.epa.gov/ncer/rfa/2006/2006_star_uncertainty.html (HTML)

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