While MII has been proposed and analyzed in recent studies, , methodologies have not been 85 standardized and there is little agreement on how to resolve temporal differences between BU and TD estimates . O&G sites exhibit highly variable emissions due variation in site operations (e.g. natural cycling of production wells), changes in equipment state (e.g. compressor start/stop, malfunctions, etc.), episodic events (e.g. blowdowns, liquid unloading, pipeline pigging, well swabbing), diurnal and seasonal variations , see Figure . While traditional inventories include many of these sources, the variability 90 is averaged out in the annual results these methods generate.