EPA is inviting small businesses, governments, and not-for-profit organizations to participate in two Small Business Advocacy Review Panels to establish standards for vehicle emissions and update emission standards for refineries. The first panel will propose standards for vehicles and gasoline, and changes to fuel certification for all categories of gasoline-powered highway vehicles and nonroad engines and equipment. The second panel will develop emissions standards for petroleum refineries for multiple pollutants, including greenhouse gases. Self-nominations must be received by May 16. For more information, go to http://www.epa.gov/sbrefa/tier3.htm and http://www.epa.gov/sbrefa/refinery.htm