ERG’s Year 2014 Gulfwide Emissions Inventory Study was recently featured in BOEM’s quarterly report. We conducted this study under our sixth consecutive contract with BOEM to develop air pollutant emission inventories for the Gulf of Mexico Outer Continental Shelf. As part of this work, ERG updated the Gulfwide Offshore Activities Data System to collect activity data for offshore oil and gas production platforms and developed emission estimates for other oil and gas production sources in the Gulf. Using geographic and automatic information systems data, we also spatially allocated vessel movements throughout the Gulf. BOEM, EPA, state and local agencies, and regional planning organizations can use these inventory data to assess the effectiveness of air pollution control strategies.