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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 particulate matter. EPA is currently reviewing the NAAQS for particulate matter. Primary standards set limits to protect public health, including the health of "sensitive" populations such as asthmatics, children, and the elderly. Secondary standards set limits to protect public welfare, including protection against decreased visibility, damage to animals, crops, vegetation, and buildings.On October 10, 2018, Acting Administrator Andrew Wheeler announced ( that the seven-member Chartered CASAC will serve as the body to review the remaining key scientific assessments for the PM NAAQS review.As part of the NAAQS review process, EPA's Office of Research and Development has requested CASAC review of the Integrated Science Assessment for Particulate Matter - (External Review Draft - October 2018).

Aaron Yeow

On this page:

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

Panel Formation

Nominations of Experts:


Public Meetings and/or Teleconferences

Meeting DateTitle
03/28/2019 to 03/28/2019Chartered Clean Air Scientific Advisory Committee (CASAC) Public Teleconference on Particulate Matter (PM)
12/12/2018 to 12/13/2018Chartered Clean Air Scientific Advisory Committee (CASAC) Public Meeting on Particulate Matter

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