This memorandum, dated 25 January 2018, withdraws the "once in always in" policy for the classification of major sources of hazardous air pollutants under section 112 of the Clean Air Act. With the new guidance, sources of hazardous air pollutants previously classified as "major sources" may be reclassified as "area" sources at any time, provided the facility limits its potential to emit below major source thresholds.
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