On August 13, 2020, the Environmental Protection Agency (EPA) issued a final rule titled "Oil and Natural Gas Sector: Emission Standards for New, Reconstructed, and Modified Sources Review," in response to President Trump's 2017 Executive Order on Promoting Energy Independence and Economic Growth. The order directed agencies to review existing regulations that potentially "burden the development or use of domestically produced energy resources," including oil and natural gas, and to suspend, revise or rescind regulatory requirements if appropriate. In 2017, the EPA provided notice to initiate the review of the oil and natural gas new source performance standards (NSPS) and, if appropriate, to initiate proceedings to suspend, revise or rescind the rule. Subsequently, in a notice dated June 5, 2017, the EPA further committed to look broadly at the entire NSPS. Specifically, this final rule amends the NSPS at 40 Code of Federal Regulations part 60, subpart OOOO (promulgated in 2012) and OOOOa (promulgated in 2016). These amendments remove sources in the transmission and storage segment from the source category, rescind the NSPS including both the volatile organic compounds and methane requirements applicable to those sources, and separately rescinds the methane-specific requirements of the NSPS applicable to sources in the production and processing segments. Furthermore, the EPA adopts an interpretation of Clean Air Act section 111 under which the EPA, as a predicate to promulgating NSPS for certain air pollutants, must determine that the pertinent pollutant causes or contributes significantly to dangerous air pollution. In a separate action on August 13, 2020, to respond to petitions for reconsideration on the 2016 rule, EPA finalized targeted technical amendments to the NSPS. EPA finalized the two rules concurrently to simplify compliance requirements.