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Regulatory Impact Analysis for the Final Revisions to the National Ambient Air Quality Standards for Particulate Matter

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Based on its review of the air quality criteria and the national ambient air quality standards (NAAQS) for particulate matter (PM), the U.S. Environmental Protection Agency (EPA) is making revisions to the primary standards for PM to provide requisite protection of public health and welfare. The EPA is revising the primary annual (health-based) standard, retaining the primary 24-hour standard, and retaining the secondary (welfare-based) NAAQS for fine particles (generally referring to particles less than or equal to 2.5 micrometers [μm] in diameter—PM2.5). The EPA is retaining the current primary and secondary 24-hour PM10 standards.
As has traditionally been done in NAAQS rulemakings, the EPA has conducted a Regulatory Impact Analysis (RIA) to provide the public with illustrative estimates of the potential costs and health and welfare benefits of attaining the revised annual standard along with two alternative standards. In NAAQS rulemakings, the RIA is prepared for informational purposes only, and the decisions related to the setting of the PM NAAQS standards are not in any way based on consideration of the information or analyses in the RIA. The RIA fulfills the requirements of Executive Orders 12866 and 13563 and guidelines of the Office of Management and Budget’s (OMB) Circular A-4.

The control strategies presented in this RIA are illustrative and represent one set of control strategies States might choose to implement in order to meet the final standards. As a result, benefit and cost estimates provided in this RIA cannot be added to benefits and costs from other regulations because each regulation is based on a different set of analytical assumptions and policy decisions. The costs and benefits identified in this RIA will not be realized until specific controls are mandated by future State Implementation Plans (SIPs) or other Federal regulations.

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EPA Office:
Office of Air and Radiation
Office Suboffice:
Office of Air Quality Planning and Standards
Office Division:
Health and Environmental Impacts Division
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Document Type:
Regulatory Impact Analysis
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