The U.S. Environmental Protection Agency (EPA) has released for public review and comment the “Fourth External Review Draft of Air Quality Criteria for Particulate Matter (June, 2003).”

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EPA has issued the fifth revised drafts of the Toxicology and Epidemiology chapters of the Criteria Document on particulate matter for public review.
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Members of EPA’s Clean Air Science Advisory Committee (CASAC) made numerous suggestions to strengthen EPA’s proposed methodology for conducting a risk assessment on coarse particles (PM10-PM2.5) at a May 1, 2003 teleconference.

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Staff scientists at EPA are suggesting that the health standards for fine particles need to be strengthened because scientific studies show serious health effects, even death, can occur at levels below the current standards.
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U.S. EPA Administrator Mike Leavitt has appoinited Dr. Rogene Henderson as the new Chair of the Clean Air Scientific Advisory Committee (CASAC).
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The U.S. Environmental Protection Agency (EPA) has released the final scientific assessment document on airborne particles, entitled the Air Quality Criteria for Particulate Matter.
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The Clean Air Scientific Advisory Committee (CASAC) finally reached closure on the particulate matter (PM) criteria document at a meeting on September 20, 2004.
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EPA has extended the schedule for the completion of the PM Criteria Document by one year, to October 2003, to allow for additional analysis of key studies.
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In May 2002, EPA published the third External Review Draft of the Criteria Document on particulate matter.
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EPA has published a draft risk assessment methodology for public comment.
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