The Massachusetts Department of Environmental Protection will hold public hearings on revisions to its 310 CMR 7.00 et seq. air pollution control regulations for Stage II Vapor Recovery, the Environmental Results Program for perchloroethylene dry cleaning facilities, and the requirements for stationary engines and combustion turbines for combined heat and power projects. Public hearings will be held April 30 and May 1, 2008. http://www.mass.gov/dep/public/hearings/08erpreg.htm.