Integrated Science Assessments (ISAs)
[NOTICE] EPA is announcing the availability of the Second External Review Draft of the Integrated Science Assessment for Sulfur Oxides – Health Criteria for public review and comment and an independent peer review. [Federal Register Notice: December 9, 2016]
EPA has set National Ambient Air Quality Standards (NAAQS) for six principal criteria air pollutants, which include:
Numerous sources emit these "criteria pollutants", which are considered harmful to public health and the environment. Since 2008, EPA’s Integrated Science Assessments (ISAs) have formed the scientific foundation for the review of the NAAQS standards. Prior to 2008, Air Quality Criteria Documents provided the scientific foundation for the NAAQS process; as part of a streamlining of the NAAQS process these documents were replaced by the ISAs.