Integrated Science Assessment (ISA) for Oxides of Nitrogen, Oxides of Sulfur and Particulate Matter Ecological Criteria (Final Report)
Notice EPA announces the availability of the final Integrated Science Assessment (ISA) for Oxides of Nitrogen, Oxides of Sulfur and Particulate Matter Ecological Criteria in an Oct 19, 2020 Federal Register Notice.
Oxides of nitrogen, oxides of sulfur, and particulate matter are three of six criteria pollutants for which EPA has established NAAQS. Periodically, EPA reviews the scientific basis for these standards by preparing an ISA (formerly called an Air Quality Criteria Document). The intent of the ISA, as described in the Clean Air Act (CAA), is to 'accurately reflect the latest scientific knowledge expected from the presence of [a] pollutant in ambient air.' It includes scientific research from atmospheric sciences, exposure and deposition, biogeochemistry, hydrology, soil science, marine science, plant physiology, animal physiology, and ecology conducted at multiple scales (e.g., population, community, ecosystem, landscape levels).
Key information and judgments formerly found in the Air Quality Criteria Documents for oxides of sulfur, oxides of nitrogen and particulate matter for ecological effects are included; appendices provide additional details supporting the ISA. Together, the ISA and appendices serve to update and revise the 2008 Integrated Science Assessment for Oxides of Nitrogen and Oxides of Sulfur - Ecological Criteria and the ecological portion of the last particulate matter ISA which was published in 2009.
Additionally, the Clean Air Scientific Advisory Committee (CASAC) is an independent science advisory committee whose review and advisory functions are mandated by Section 109(d)(2) of the Clean Air Act, and charged (among other things) with performing an independent scientific review of all the EPA’s air quality criteria.
|Oct 2020||EPA released the final report.|
|Jun 2018||EPA released the second external review draft for public review and comment. The draft document was then discussed at a CASAC meeting September 5-6. 2018.|
|Mar 2017||EPA released the first external review draft for public review and comment. The draft document was then discussed at a CASAC meeting May 24-25. 2017.|
|Jan 2017||EPA released the final Integrated Review Plan for the Secondary National Ambient Air Quality Standards for Oxides of Nitrogen, Oxides of Sulfur and Particulate Matter.|
|Dec 2016||EPA released the final Integrated Review Plan for the National Ambient Air Quality Standards for Particulate Matter.|
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.
- Integrated Science Assessment (ISA) for Oxides of Nitrogen, Oxides of Sulfur and Particulate Matter - Ecological Criteria (First External Review Draft, Mar 2017)
- Integrated Science Assessment (ISA) For Oxides of Nitrogen, Oxides of Sulfur and Particulate Matter Ecological Criteria (Second External Review Draft, Jun 2018)