35 Pa. Stat. § 4007.12
Whenever the Environmental Protection Agency has missed a deadline for developing regulations or guidance on which states must rely to comply with deadlines in the Clean Air Act by more than ninety (90) days and, in the opinion of the department, the Environmental Protection Agency has failed to provide it with timely guidance needed to comply with the act in a timely manner, the department may bring a legal action against the Environmental Protection Agency in a court of competent jurisdiction seeking an injunction to restrain the Environmental Protection Agency from enforcing the applicable Clean Air Act deadline on the Commonwealth until and unless the Environmental Protection Agency develops the appropriate regulation or guidance which allows the Commonwealth a reasonable opportunity to comply with the Clean Air Act.
35 P.S. § 4007.12