On June 25, 2018, the NAM moved to intervene in a case involving permitting requirements for manufacturers under the Clean Air Act. Environmental groups sued to challenge a guidance document from the U.S. Environmental Protection Agency (EPA) that streamlines Clean Air Act permits under the New Source Review program for facilities that expand or modify their operations. If the plaintiffs' claims are successful, facility modifications could be significantly delayed and rendered more expensive. The NAM's motion asks the court to allow the NAM to become a co-defendant in the case with EPA to bring the voice of manufacturers in defense of the EPA's sensible policy.
On July 13, 2018, the court held the case in abeyance pending the completion of an EPA rulemaking to implement the terms of the guidance document. The litigation is expected to reactivate when the final rule issues.