Maximum Achievable Control Technology (MACT)

Definition - What does Maximum Achievable Control Technology (MACT) mean?

Maximum Achievable Control Technology is a requirement of federal control technology used for reducing the harmful effects of hazardous air pollutants produced by various industries. The control technology, as misconception can be considered as the extravagant emission control devices like thermal-oxidizers, bio-filters and scrubbers, but it actually refers to the methods, measures, systems, techniques or processes used for limiting the emissions of dangerous air pollutants. They are used to limit the emissions depending on established control practices or technologies applied on major sources which emit toxic pollutants.

Petropedia explains Maximum Achievable Control Technology (MACT)

Maximum Achievable Control Technology is different for the existing and new sources.

For new sources:

The highest degree of reduction of the emissions allowed achievable but not less forceful than the emission control which is achieved by similar sources that are best controlled.

For existing sources:

  • It has been promulgated or proposed for a peculiar category of the source or facility.
  • The average ejection limitation that is obtained by best performing 12% of existing sources or facilities for which the EPA has ejection information when the specific category of facility or source contains thirty or more sources.
  • The average ejection limitation that is obtained by best performing 5 of existing sources or facilities for which the EPA has ejection information when the specific category of facility or source contains less than thirty sources.

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