For Toxic Best Available Control Technology(TBACT) we have a term and definition in Air Quality.

Similar to BACT standards except applies to sources of toxic emissions. In many cases, it is the same as BACT. The standards are 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
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