The paper summarizes recent successes in, as well as work in progress (with the cooperation of industry) on, EPA's stratospheric ozone engineering research. The Montreal Protocol and U.S. regulations implementing the Protocol necessitate that engineering solutions be found and implemented to avoid the use of certain chlorofluorocarbons (CFCs) and halons. CFCs and halons are used for solvents, refrigerants, aerosol propellants, foams, and fire protection. Nearly all EPA activities in this program involve pollution prevention as the first alternative. This includes alternative processes, alternative chemicals, alternative means of accomplishing the desired service, and recycling. Industry cooperation is needed in order to take advantage of industry's expertise, to get industry to buy into the solution, to conserve valuable time and resources, and to implement results rapidly. Since the problem will be solved only through international efforts, the U.S. is also placing high priority on technical assistance to developing countries.