Under the Clean Air Act, the USEPA is required to develop standards for industrial categories of "major" sources of hazardous air pollutants (HAPs) that require the application of maximum achievable control technology (MACT). Section 112(g) requires a "case-by-case MACT determination" by the Air Quality Division if a major source is constructed or reconstructed before the USEPA issues a MACT regulation for that particular source category. Section 112(j), commonly referred to as the "MACT hammer," requires a case-by-case MACT determination if USEPA fails to promulgate a standard within 18 months after the scheduled date.
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