Pennsylvania oil and gas producers and midstream operators are faced with yet another suite of federal air regulations following the U.S. Environmental Protection Agency's recent finalization of its far-reaching Methane Rule. On Dec. 2, the EPA released a 1,690-page, pre-publication version of the Methane Rule or the Standards of Performance for New, Reconstructed, and Modified Sources and Emissions Guidelines for Existing Sources: Oil and Natural Gas Sector Climate Review. The Methane Rule is aimed at strengthening existing and adding new regulations limiting emissions of methane and volatile organic compounds (VOCs) from the crude oil and natural gas industrial source category. These federal Clean Air Act (CAA) regulations will apply to a host of new and existing emission sources and activities within the oil and natural gas industry. With Pennsylvania producing more natural gas than any other state except Texas, oil and gas producers and midstream operators must contend with another slate of new, more stringent federal air requirements.