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  2. Air Toxics Screening Assessment

2017 AirToxScreen Technical Support Document

Supporting documentation for the Air Toxics Screening Assessment can be found in the Technical Support Document.  This document describes the data and approaches used to conduct the assessment.  The document includes descriptions of how we:

  • Compiled emissions data and prepared them for use as model inputs (Section 2);
  • Estimated ambient concentrations of air toxics (Section 3);
  • Estimated exposures to air toxics for populations (Section 4);
  • Selected toxicity values (Section 5);
  • Characterized human health risks and hazards (Section 6); and
  • Addressed variability and uncertainty (Section 7).

This document satisfies basic documentation protocol expected of EPA products and also provides a resources for the technically oriented user community by summarizing the data sources, methods, models, and assumptions used in AirToxScreen.  The document does not provide quantitative results and thus presents no exposure or risk estimates.  Results and other specific information for the latest AirToxScreen can be found on the assessment results page. 


  • 2017 AirToxScreen: Technical Support Document (pdf) (10 MB)
  • 2017 AirToxScreen Supplemental Data files (zip) This data folder contains supplemental data files referred to in the TSD, which include pollutants included in AirToxScreen, model evaluations, exposure factors and other information used for the 2017 AirToxScreen. 

  • Ethylene Oxide emissions calculations from commercial sterilizers (pdf) (197.92 KB) This document describes the methods used to calculate emissions of ethylene oxide from commercial sterilizers in the 2017 AirToxScreen.

Air Toxics Screening Assessment

  • AirToxScreen Overview
    • AirToxScreen Limitations
    • Glossary of Terms
    • Frequent Questions
  • 2020 AirToxScreen
    • 2020 AirToxScreen Results
    • AirToxScreen Mapping Tool
    • AirToxScreen Assessment Methods
Contact Us About Air Toxics Screening Assessment
Contact Us to ask a question, provide feedback, or report a problem.
Last updated on March 10, 2025
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