Air Quality: EPA's Integrated Science Assessments (ISAs)
Integrated Science Assessment (ISA) for Oxides of Nitrogen and Sulfur Environmental Criteria (First External Review Draft, Dec 2007)
Archived files are provided for reference purposes only. The file was current when produced, but is no longer maintained and may now be outdated. Persons with disabilities having difficulty accessing archived files may contact the NCEA Webmaster for assistance. Please visit http://epa.gov/ncea to access current information.
EPA is announcing that the First External Review Draft of the Integrated Science Assessment (ISA) for Oxides of Nitrogen and Sulfur – Environmental Criteria has been made available for independent peer review and public review. This draft ISA document represents a concise synthesis and evaluation of the most policy-relevant science and will ultimately provide the scientific bases for EPA’s decision on retaining or revising the current secondary standards for NO2 and SO2.
This draft ISA was prepared as part of the joint review of the secondary or welfare-based NAAQS for oxides of nitrogen and sulfur. The draft 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 draft ISA provides more extensive and detailed summaries of the most pertinent scientific literature. This is EPA’s latest evaluation of the scientific literature 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.
|1982||EPA released the document Air Quality Criteria for Oxides of Nitrogen and the Air Quality Criteria for Particulate Matter and Sulfur Oxides.|
|Aug 1993||EPA released the final document Air Quality Criteria for Oxides of Nitrogen.|
|Dec 2005||EPA published a Call for Information on Oxides of Nitrogen in a December 9, 2005 Federal Register Notice.|
|May 2006||EPA put out a call for related information in a May 15, 2006 Federal Register Notice to update the science assessment for sulfur oxides.|
|July 2007||EPA hosted a workshop on the assessment of environmental and welfare effects science for the review of the secondary NAAQS for Oxides of Nitrogen and Sulfur.|
|Aug 2007||EPA released the draft document, Integrated Science Assessment (ISA) for Oxides of Nitrogen – Health Criteria (First External Review Draft).|
|Sep 2007||EPA released the draft document, Integrated Science Assessment for Sulfur Oxides - Health Criteria and the Annexes (First External Review Draft).|
|Dec 2007||EPA releases the First 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.|
|Feb 2008||EPA releases the Annexes for the Integrated Science Assessment (ISA) for Oxides of Nitrogen and Sulfur Environmental Criteria (First External Review Draft).|
This download(s) is distributed solely for the purpose of pre-dissemination peer review under applicable information quality guidelines. It has not been formally disseminated by EPA. It does not represent and should not be construed to represent any Agency determination or policy.