EPA Clean Air Scientific Advisory Committee (CASAC)

Nitrogen Dioxide and Sulfur Dioxide Risk/Exposure Methods for Secondary (Welfare-based) National Ambient Air Quality Standards (NAAQS)

EPA Designated Federal Officer (DFO):Kyndall Barry

Responsible Committee/Panel:Oxides of Nitrogen (NOx) and Sulfur Oxides (SOx) Secondary Review PanelA list of members can be found in the final report included in the Advisory Activity linked to this panel or committee.

See EPA’s PDF page to learn more about PDF files.


EPA’s Office of Air and Radiation has requested CASAC consultative advice on a draft document, "Scope and Methods Plan for Risk/Exposure Assessment: Secondary NAAQS Review for oxides of nitrogen and oxides of sulfur," intended to outline the scope and approaches for conducting an exposure analysis and welfare risk assessment for those criteria pollutants.

Under the Clean Air Act, EPA is required to carry out a periodic review and revision, as appropriate, of the air quality criteria and the primary and secondary standards for six criteria air pollutants, which include nitrogen dioxide and sulfur dioxide. Secondary standards set limits to protect public welfare, including protection against decreased visibility, damage to animals, crops, vegetation, and buildings.