[20070620]RS22682_臭氧空气质量标准：环境保护局提出的修改.pdf

1 The schedule was set by a consent decree that settled a lawsuit filed by the American LungAssociation (American Lung Association v. Leavitt, D.D.C., No. 03-778, modified consentdecree approved 12/16/04). EPA agreed that it would propose whether to retain or revise theozone standard by June 20, 2007, and take final action by March 12, 2008.Order Code RS22682June 20, 2007Ozone Air Quality Standards: EPAs ProposedChangesJames E. McCarthySpecialist in Environmental PolicyResources, Science, and Industry DivisionSummaryEPA is expected to propose changes to the National Ambient Air Quality Standardfor ozone on June 20, 2007. The proposal follows a multi-year review of the scienceregarding ozones effects on public health and welfare. If the agency decides tostrengthen the standard, it will set in motion a long and complicated implementationprocess that has far-reaching impacts for public health, for sources of pollution innumerous economic sectors, and for states and local governments. This report discussesthe standard-setting process and the specifics of the ozone standard, and describes thesteps that will follow EPAs proposal.On June 20, 2007, EPA is expected to propose revisions to t