National-Scale Air Toxics Assessment for 1996

Note: EPA no longer updates this information, but it may be useful as a reference or resource.

EPA Science Advisory Board Review

This webpage contains the final Science Advisory Board's peer review advisory report, as well as the draft report that EPA submitted to the Science Advisory Board on January 19, 2001, copies of the slide presentations for the March 20, and 21, 2001 public meeting in Research Triangle Park, North Carolina, the agenda for the public meeting, and copies of materials that EPA sent to the SAB related to their review.

EPA's January 2001 Draft Report: National-Scale Air Toxics Assessment for 1996

NOTE: THIS DOCUMENT IS A PRELIMINARY DRAFT. It has not been formally released by the U.S. Environmental Protection Agency and should not at this stage be construed to represent Agency policy or factual conclusions. This document is being provided now for review to EPA's Science Advisory Board. It should not be cited or referred to as EPA's final National-Scale Air Toxics Assessment.

This is a 205 page draft document (2 MB) on EPA's National-Scale Air Toxics Assessment that looks at nationwide inhalation risks from outdoor emissions of 33 pollutants (33 air toxics plus diesel particulate). EPA is soliciting the views of the Agency's Science Advisory Board through peer review before finalizing the results and before drawing conclusions about the relative risks of the air toxics examined in this assessment. The purpose of this national-scale assessment is to characterize the cancer risks and noncancer health effects of these air toxics on a broad scale to help identify pollutants of greatest potential concern to the greatest number of people. This will help set priorities for the collection of additional air toxics data to improve future assessments. Due to the broad scale of the approach, it is not designed to characterize risks sufficiently for regulatory action or to identify risks at a local or neighborhood scale. The national-scale assessment is just one of several approaches EPA uses to evaluate air toxics. The results are most meaningful when viewed at the state or national level; for smaller areas, the assessment becomes less certain. For analysis of air toxics in these smaller areas, EPA relies on other tools such as monitoring and local-scale assessments to evaluate potential "hot spots" using more refined and localized data.

Note: The last 25 pages of the report describe the contents of each Appendix.


National-Scale Air Toxics Assessment for 1996: Draft for EPA Science Advisory Board Review
Appendix-A: Summary of July 2000 Peer Review of the Draft Document "Planning and Scoping the Initial National-Scale Assessment: An Element of the EPA National Air Toxics Program"
Appendix-B: HAPEM4 User's Guide, with Microenvironment Factor Report
Appendix-C: EMS-HAP User's Guide
Appendix-D: Development of the Emissions Inventory
Appendix-E: ASPEN User's Guide
Appendix-F: Estimation of Background Concentrations for Diesel Particulate Matter
Appendix-G: Health Effects Information Used in Cancer and Noncancer Risk Characterization for the NATA 1996 National-Scale AAssessment/td>
Appendix-H: Estimating Carcinogenic Potency for Mixtures of Polycyclic Organic Matter (POM) for the 1996 National-Scale Assessment
Appendix-I: Model-to-Monitor Comparison Methods
Appendix-J: Comparison of ASPEN Results to Monitored Concentrations
Appendix-K: HAPEM4 Results
Appendix-L: Risk Characterization Results

Slide Presentations for the March 20, and 21, 2001 public meeting

	Introduction and Overview of the Air Toxics Program
	Emissions Inventory & Processing
	Dispersion Modeling & Model-Monitor Comparison
	Inhalation Exposure Modeling (large file--2.8 MB)
	Dose-Response Assessment
	Risk Characterization
	Presenting Results to the Public
	Discussion of Research

Agenda

Agenda for the March 20, and 21, 2001 public meeting

Supplemental Materials sent to the Science Advisory Board

HAPEM-MS - Peer reviewed in October 1994 by Tadeusz E. Kliendienst, Andrew Sivak, Thomas H. Stock, Jaroslav J. Vostal, and Clifford P. Weisel

HAPEM3 - Developed by ORD and recently used by OTAQ as part of 202(l); (Peer reviewed by Ted Johnson in August 1999)

HAPEM3 - Developed by ORD and recently used by OTAQ as part of 202(l); (Peer reviewed by NESCAUM in October 1999)

HAPEM4 -Technical Expert Peer Review in July 2000 of ME factors (Petros Koutrakis--Reviewed as part of "NATA - Planning and Scoping Document")

HAPEM4 -Technical Expert Peer Review in July 2000 of ME factors (Brian Leaderer--Reviewed as part of "NATA - Planning and Scoping Document")

HAPEM4 -Technical Expert Peer Review in July 2000 of ME factors (Will M. Ollison--Reviewed as part of "NATA - Planning and Scoping Document")

	HAPEM-MS - Peer reviewed in October 1994 by Tadeusz E. Kliendienst, Andrew Sivak, Thomas H. Stock, Jaroslav J. Vostal, and Clifford P. Weisel
	HAPEM3 - Developed by ORD and recently used by OTAQ as part of 202(l); (Peer reviewed by Ted Johnson in August 1999)
	HAPEM3 - Developed by ORD and recently used by OTAQ as part of 202(l); (Peer reviewed by NESCAUM in October 1999)
	HAPEM4 -Technical Expert Peer Review in July 2000 of ME factors (Petros Koutrakis--Reviewed as part of "NATA - Planning and Scoping Document")
	HAPEM4 -Technical Expert Peer Review in July 2000 of ME factors (Brian Leaderer--Reviewed as part of "NATA - Planning and Scoping Document")
	HAPEM4 -Technical Expert Peer Review in July 2000 of ME factors (Will M. Ollison--Reviewed as part of "NATA - Planning and Scoping Document")

National-Scale Air Toxics Assessment for 1996

EPA Science Advisory Board Review

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