Integrated Science Assessments (ISAs)

NOTICE: EPA is announcing a series of webinar workshops to evaluate initial draft materials for the Particulate Matter Integrated Science Assessment (ISA) for health and welfare effects on June 9th, 13th, 20th, and 22nd, 2016. Find additional details on the webinars in the May 11, 2016 Federal Register Notice.

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. 

Calendar of Workshops and Meetings



Clean Air Scientific Advisory Committee (CASAC), which provides independent advice to EPA on the technical basis for the NAAQS, is the primarily reviewing authority for the ISAs.

The CASAC Calendar includes a complete list of past and future meeting details.