Maximum Achievable Control Technology (MACT) (Sec 112(d))

Maximum Achievable Control Technology (MACT) under Section 112(d) of the Clean Air Act sets emission standards for major sources of hazardous air pollutants, requiring them to apply the most effective control methods that are technologically and economically feasible. The rule is tailored to each pollutant and source category, using performance data to define the highest level of emission reduction that can be achieved in practice.