## Environmental Assessment http://cfpub.epa.gov/ncea/cfm/ recordisplay.cfm?deid=201485 

# Integrated Science Assessment (ISA) for Oxides of Nitrogen and Sulfur Ecological Criteria (Final Report)

EPA has released the final report, Integrated Science Assessment (ISA) for Oxides of Nitrogen and Sulfur - Ecological Criteria . This final ISA document represents a concise synthesis and evaluation of the most policy-relevant science an d will ultimately provide the scientific bases for EPA's decisio n on retaining or revising the current secondary standards for NO 2 and SO 2 .

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Oxides of nitrogen and oxides of sulfur are two of six principal (or criteria ) pollutants for which EPA has established national ambient air quality standards (NAAQS). The Clean Air Act requir es EPA to periodically review the scientific basis for these standards by preparing an Integrated Science Assessment (ISA) , formerly called an Air Quality Criteria Document (AQCD). The previous AQCDs for oxides of nitrogen and sulfur were released in 1993 and 1982, respectively. This ISA was prepared as part of the joint review of the secondary or welfare-based NAAQS for oxides of nitrogen and sulfur. The ISA evaluates and integrates the newly available environmental evidence, and contains the key information and judgments formerly found in the AQCD. A series of Annexes to the ISA provides more extensive and detailed summaries of the most pertinent scientific literature. This is EPA’s latest evaluation of the scientific lit erature on the potential adverse environmental effects resulting from exposures to oxides of nitrogen and sulfur. There are significant new data, particularly with regards to acidification and nitrogen enrichment, that strengthen the evidence for these effects since the last scientific review documents were released.

This is the final report.
For technical questions only, contact Tara Greaver. All other questions should be directed to the contact us link listed below. Notice [12/22] On December 22, 2008, an updated version of the ISA was posted to this site. In this updated version, the Executive Sum mary has been revised stylistically and graphics resolution has been adjusted in the ISA. No substantive changes have been made to the d ocument. In addition, the Executive Summary and individual ISA and Annex chapters have been posted as separate files. The Integrated Science Assessment for Oxides of Nitrogen and Sulfur - Ecological Criteria and the Annexes were announced in a December 12, 2008 Federal Register Notice . 

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Histor y /Chronolo gy 1982 EPA released the document Air Quality Criteria for Oxides of Nitrogen and the AirQuality Criteria for Particulate Matter and Sulfur Oxides . Aug 1993 EPA released the final document Air Quality Criteria for Oxides of Nitrogen . Dec 2007 EPA releases the Integrated Science Assessment (ISA) for Oxides of Nitrogen and Sulfur – Environmental Criteria (First External Review Draft) for an external peer review and public comment. Aug 2008 EPA releases the Second External Review Draft of the Integrated Science Assessment (ISA) for Oxides of Nitrogen and Sulfur – Environmental Criteria document for an external peer review and public comment. Dec 2008 EPA releases the final report of the Integrated Science Assessment (ISA) for Ox ides of Nitrogen and Sulfur – Ecological Criteria document. 

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# Page 1 of 2 Integrated Science Assessment (ISA) for Oxid es of Nitrogen and Sulfur Ecological Crite r ...

7/5/2011 http ://cf p ub.e p a. g ov/ncea/cfm/recordis p la y .cfm?deid=201485U.S. EPA. Integrated Science Assessment (ISA) for Oxides of Nitr ogen and Sulfur Ecological Criteria (Final Report). U.S. Enviro nmental Protection Agency, Washington, DC, EPA/600/R-08/082F, 2008.

 Integrated Science Assessment for Oxides of Nitrogen and Sulfur – Ecological Criteria (Final Report) (PDF) (898 pp, 42 MB, about PDF )  ISANOx - SOx Final: Front Matter (PDF) (37 pp, 4 MB, about PDF )  ISANOx - SOx Final: Executive Summary (PDF) (13 pp, 4 MB, about PDF )  ISANOx - SOx Final: Chapter 1. Introduction (PDF) (8 pp, 4 MB, about PDF )  ISANOx - SOx Final: Chapter 2. Source to Deposition (PDF) (191 pp, 17 MB, about PDF )  ISANOx - SOx Final: Chapter 3. Ecological and Other Welfare Effects (PDF) (206 pp, 9 MB, about PDF )  ISANOx - SOx Final: Chapter 4. Summary and Conclusions (PDF) (44 pp, 4 MB, about PDF )  ISANOx - SOx Final: Annex A. Ecosystem Monitoring and Models (PDF) (51 pp, 5 MB, about PDF )  ISANOx - SOx Final: Annex B. Acidification Effects (PDF) (121 pp, 7 MB, about PDF )  ISANOx - SOx Final: Annex C. Nutrient Enrichment Effects from Nitrogen (PDF) (45 pp, 5 MB, about PDF )  ISANOx - SOx Final: Annex D. Critical Loads (PDF) (22 pp, 4 MB, about PDF )  ISANOx - SOx Final: Annex E. Effects of NO Y, NH X, and SOx on Structures and Materials (PDF) (16 pp, 4 MB, about PDF )  ISANOx - SOx Final: Annex F. Valuation of the Environmental Effects of N and S (Non - Materials) (PDF) (40 pp, 4 MB, about PDF )  ISANOx - SOx Final: Glossary & References (PDF) (104 pp, 13 MB, about PDF ) 

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# Page 2 of 2 Integrated Science Assessment (ISA) for Oxid es of Nitrogen and Sulfur Ecological Crite r ...

7/5/2011 http ://cf p ub.e p a. g ov/ncea/cfm/recordis p la y .cfm?deid=201485