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Particulate Matter (PM) PM2.5 Status

Health-Based Ambient Air Quality Standards

Since the PM10 standards were established in 1987, a large number of studies have been published on PM health effects, such as premature mortality, hospital admissions, and respiratory illnesses. Based on health studies, PM2.5 is considered to be more adverse to human health than any other pollutant. EPA adopted the first national air quality standards for the fine fraction of particulates, PM2.5, in July 1997. EPA set the annual PM2.5 standard at 15 g/m3 and the 24-hour PM2.5 standard set at 65 g/m3. EPA designated the Valley as nonattainment for PM2.5; the Valleys current air quality is within the 1997 24-hour standard, but not the annual standard. The District must show how the Valley will attain the 1997 PM2.5 standards in the 2008 PM2.5 Plan, which is due to EPA in April 2008.

On October 17, 2006, EPA issued its final rule to revise the national ambient air quality standards for PM in the Federal Register. This rule revoked the annual PM10 standard and retained the existing 24-hour PM10 standard of 150 g/m3. EPA also retained the existing annual PM2.5 standard of 15 g/m3, but lowered the 24-hour PM2.5 standard to 35 g/m3. EPA will designate areas under the new standard by November 2009, effective April 2010, and state implementation plans for the 2006 standards will be due to EPA by April 2013. Areas must attain the 2006 standards by April 2015, though extension to April 2020 is possible.

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