The report gives highlights of EPA high-temperature and high-pressure programs aimed at demonstrating control technology to meet environmental standards for the ambient concentration of particles and the emission rate of particles from new sources. Among the control devices considered in the EPA programs were cyclones, granular bed filters, dry scrubbers, molten scrubbers, electrostatic precipitators (ESPs), ceramic bag filters, and other (non-bag) ceramic filters. Advantages and disadvantages of the devices involve parameters such as simplicity of operation, materials problems, inability to collect submicron particles, difficulty in regenerating the collection media, and those related to cost, including size and pressure drop. Since these advantages and disadvantages can be weighed differently, according to the needs of a specific application, it is not possible to give universal conclusions. However, if the most important consideration is control of submicron particles, ceramic filters are foremost. Although particulate control equipment can be demonstrated to have high collection efficiency in some applications, extreme conditions of temperature, pressure, or both pose special problems. The need for control at extreme condition arises in metallurgical operations and advanced energy processes.