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Maximum Achievable Control Technology (MACT) Standards is a level of control that was introduced by Title III of the 1990 Clean Air Act Amendments. The purpose of these amendments was to expedite the development of standards that would reduce hazardous air pollutant (HAP) emissions.

Title V of the federal Clean Air Act reauthorization (1990) requires each state to develop a Permit-to-Operate system and emission fee program for major sources of air pollution. The operating permit program streamlines the way federal, state, tribal and local authorities regulate air pollution by consolidating all air pollution control requirements into a single, comprehensive operating permit that covers all aspects of a source's year-to-year air pollution activities.