Proposed Methodology for Fine Particulate Matter

Learn about the Air District's proposed methodology to determine local health risks from fine particulate matter.

Proposed Methodology for Determining Local Health Risks from Fine Particulate Matter (PM2.5)

The Air District is seeking comments on a draft white paper and accompanying spreadsheet that proposes and illustrates a methodology for modeling health risks attributable to local sources of fine particulate matter, or PM2.5.

The purpose of this methodology is to support the assessment and regulation of health risks from PM2.5 at a local level. This proposed methodology has been developed by the Air District with guidance from the Air District's Advisory Council in consultation with staff at the United States Environmental Protection Agency, the California Air Resources Board, and California's Office of Environmental Health Hazard Assessment.

The white paper only proposes and demonstrates a methodology. Applications of the methodology - for example, setting thresholds or use in a regulatory context - will be discussed in later public forums and workshops. At this time, the Air District seeks comments only related to the methodology. The methodology will be discussed at upcoming Advisory Council meetings.

Documents Available for Comment


The Air District provides opportunities for the public to submit comments throughout the development process, and posts comments received during the open public comment periods.

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Written comments on the draft white paper and accompanying spreadsheet must be received by 9:00 AM on Wednesday, November 30, 2022. Public comments may be submitted via email or mail:

Attention: Dr. David Holstius
Senior Advanced Projects Advisor
375 Beale Street, Suite 600
San Francisco, CA 94105
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Last Updated: 9/29/2022