Outer Continental Shelf Air Regulations Consistency Update for Massachusetts

EPA is approving an update to a portion of the Outer Continental Shelf ("OCS") Air Regulations. Requirements applying to OCS sources located within 25 miles of States' seaward boundaries must be updated periodically to remain consistent with the requirements of the corresponding onshore area ("COA"), as mandated by the Clean Air Act ("the Act"). The portion of the OCS air regulations that is being updated pertains to the requirements for OCS sources in the Commonwealth of Massachusetts. The intended effect of approving the OCS requirements for the Commonwealth of Massachusetts is to regulate emissions from OCS sources in accordance with the requirements onshore. The change to the existing requirements discussed below is incorporated by reference into the Code of Federal Regulations and is listed in the appendix to the OCS air regulations.