Tag Archives: MACT

US EPA Formally Proposes Repeal of “Once In, Always In” Policy

On June 25, 2019, US EPA issued a proposed rule that would reverse the “once in, always in” policy for sources of hazardous air pollutants (HAP) that has been in place for more than 20 years. The rulemaking formalizes a January 2018 US EPA memorandum repealing the policy, an action that was challenged by environmental groups and … Continue Reading

Amid Pushback, US EPA’s Reversal on “Once In Always In” Policy Opens Door to Reduced Clean Air Act Obligations

On January 25, 2018, Bill Wehrum, the new Assistant Administrator of US EPA’s Office of Air and Radiation, issued a memorandum to all Regional Air Division Directors rescinding US EPA’s historic “Once In Always In” (OIAI) policy for major sources under US EPA’s National Emission Standards for Hazardous Air Pollutants (NESHAP) program. Under the “Once In Always In” (OIAI) … Continue Reading

46 Industry Sources Could Face More Stringent USEPA Regulation, Is Yours One of Them?

On August 23, 2013, environmental groups represented by Earthjustice alerted USEPA in a 60 day notice letter that the groups intend to sue the Agency for its alleged failure to comply with Clean Air Act (CAA) §112(d) and §112(f) by failing to revise maximum achievable control technology (MACT) standards for 46 source categories within eight … Continue Reading
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