EPA proposes elimination of current MACT policy

On Jan. 3, 2007, the US Environmental Protection Agency (EPA) published a proposed rule in the Federal Register that would eliminate its “once in, always in” policy on maximum achievable control technology (MACT) standards.1 If promulgated, reversal of this decade-old policy will allow facilities currently subject to MACT standards to be exempt from MACT upon reducing emissions below major source thresholds for hazardous air pollutants (HAPs).Under existing policy, if a facility is a “major source” of HAP emissions on the first substantive compliance date of the MACT standard, it will always be subject to the MACT standard. With several MACT standards already in pl...

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