Oil and Natural Gas NSPS 4Oa Regulation (January 22, 2018) – Effective August 2, 2016, the USEPA established emission standards and compliance schedules for the control of greenhouse gas (GHG) emissions from affected facilities in the crude oil and natural gas source category that commence construction, modification, or reconstruction after September 18, 2015.  The final regulation became effective August 2, 2016 and potentially affects storage vessels, compressors, pneumatic controllers, diaphragm pumps, and fugitive emissions. Please contact Jeff Pursley (Senior Air Quality Specialist) at (918) 665-6575 or jpursley@aandmengineering.com for further information.