EPA staff scientists recently completed their review and recommended that the administrator consider tightening some standards. The PM10 and PM2.5 specifications were designed to control particulate emissions that are either equal to or less than 10 microgram or 2.5 micrograms respectively. This is the second draft and has no direct affect on the standards.

For more information about the recommendations, read Lynn Bergeson's Legal Lookout column in this issue. Download staff's recommendations at www.epa.gov/ttn/naaqs/standards/pm/s_pm_index.html.