NOVEMBER 1999  VOL. 9, NO. 4  EPA-status of pm 2.5 EPA had proposed a dramatic tightening of air-quality standards covering two kinds of pollution: ozone (smog) and particulate matter (PM). The agency's current PM standard calls for the regulation of dust, dirt and similar particles down to 10 microns in diameter. The agency now wants to add regulations governing particles as small as 2.5 microns. A federal appeals court denied EPA's request for a rehearing of the ozone and particulate matter (PM) case it lost earlier this year. A three-judge panel in May struck down the agency's ozone and PM standards on the grounds that EPA used faulty science and overstepped its authority in issuing the rules. The case now appears headed to the Supreme Court. Back to Wireline Contents American Wire Producers Association 801 North Fairfax Street, Suite 211 Alexandria, VA 22314-1757 Tel (703) 299-4434 | Fax (703) 299-9233 | E-mail info@awpa.org | Web: www.awpa.org