Supplement to the 2019 Integrated Science Assessment for Particulate Matter (External Review Draft)

Issuing agencies

Abstract

The Environmental Protection Agency (EPA) is announcing the availability of a draft document titled, "Supplement to the 2019 Integrated Science Assessment for Particulate Matter (External Review Draft)" (EPA/600/R-21/198). The document was prepared by the Center for Public Health and Environmental Assessment (CPHEA) within EPA's Office of Research and Development (ORD) as part of the reconsideration of the 2020 National Ambient Air Quality Standard (NAAQS) for particulate matter (PM). The Supplement represents a targeted review of peer-reviewed studies published since the literature cutoff date (i.e., ~January 2018) of the 2019 Integrated Science Assessment for Particulate Matter (PM ISA). The Supplement and the 2019 p.m. ISA provide the scientific basis for EPA's decisions, in conjunction with additional technical and policy assessments, for the reconsideration of the current NAAQS and the appropriateness of possible alternative standards. EPA is releasing this draft document to seek review by the Clean Air Scientific Advisory Committee (CASAC) and the public. In addition, the date and location of a public meeting for CASAC review of this document will be specified in a separate Federal Register document. This draft document is not final and it does not represent, and should not be construed to represent, any final Agency policy or views. When revising the document, EPA will consider any public comments submitted during the public comment period specified in this notice.