More than 325 representatives of utilities, research organizations, vendors, engineering service firms, universities and regulatory agencies attended the EPRI workshop on NOX Controls for Utility Boilers in Cambridge, Massachusetts, July 7-9,1992. The workshop featured more than 30 presentations on regulatory developments, low-NOX burner (LNB) retrofits for coal-, oil- and gas-fired units, overfire air and reburning retrofits, postcombustion NOX controls and LNB procurement issues.