Under the Clean Air Act, a facility that emits air pollutants may not be constructed unless an air permit has been issued to the facility. For decades, EPA has interpreted the statute to prohibit almost any construction or modification activities until a permitting authority issues a final permit. But on March 25, 2020, EPA proposed new guidance to clarify that, according to regulations adopted 40 years ago, the only construction prohibited prior to issuance of an air permit is construction on the emitting unit itself. If adopted by state permitting authorities, this guidance should provide companies, such as pipeline project proponents, with more flexibility by allowing more construction activities pre-permit. That said, project proponents should carefully consider the risks associated with initiating construction prior to receiving an air permit.
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