ter and EPA's proposed schedule for regulatory implementation of the new standards (Table 1.1), Congress mandated and appropriated substantial funds for EPA to conduct a major research program to reduce the scientific uncertainties. It also directed the EPA administrator to arrange for the NRC to provide independent guidance for planning the research program and monitoring its implementation. Specifically, the committee was charged to assess research priorities, and develop a conceptual research plan, and monitor research progress made over the 5 years 1998-2002 toward improved understanding of the relationships among airborne PM, its various sources, and its effects on public health.

TABLE 1.1 EPA's Review and Implementation Timetable for Particulate-Matter Standardsa

Past Actions

1971

EPA issues TSP NAAQS

1979-1987

Criteria and standards are reviewed

1987

EPA issues PM10 NAAQS

1994-1997

Criteria and standards are reviewed

1997

EPA issues PM2.5 and revised PM10 NAAQSs

1999

EPA designates areas as “unclassifiable” regarding attainment of NAAQS for PM2.5

1998-2000

PM2.5 monitors are placed nationwide

Planned Actions

1998-2003

PM2.5 monitoring data to be collected nationwide

2002

EPA will complete 5-year scientific review of PM2.5 standards, leading to possible revision

2002-2005

EPA will designate nonattainment areas for PM2.5

2005-2008

States will submit implementation plans for meeting PM2.5 standard.

2012-2017

States will have up to 10 years and two 1-year extensions to meet PM2.5 standards

a   The impact of the U.S. Supreme Court decision on this timetable is unknown. That decision is pending at the time of completion of this report.



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