For Best Available Control Technology (BACT) we have terms and definitions in 3 topics. The topics are Air Quality, Environment and Natural Gas.

An emission limitation based on using the most up-to-date methods, systems, techniques, and production processes available to achieve the greatest feasible emission reductions. These are the most stringent requirements for new or modified sources and are determined on a case-by-case basis as part of New Source Review
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The most stringent technology available for controlling emissions; major sources are required to use BACT, unless it can be demonstrated that it is not feasible for energy, environmental, or economic reasons.
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A concept taken from the Clean Air Act designed to preserve air quality from degradation by requiring that emissions from new facilities, temporary facilities, and even existing facilities in some instances be controlled to the extent possible using the best available technology.
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