Q504. The definition of the onshore natural gas transmission compression includes "any stationary combustion of compressors that move natural gas at elevated pressure

A504. We are not able to provide further guidance at this time.  Your question relates to an issue or issues currently the subject of ongoing litigation.  Please monitor the website for any additional guidance that may be available in the future. http://www.epa.gov/ghgreporting/reporters/subpart/w.html.