batch_auto_20260713 202607131256465730 BOEM ESP geoESPIS ESPIS@boem.gov Bureau of Ocean Energy Management Air Emissions Associated with Decommissioning Operations for Pacific Outer Continental Shelf (OCS) Oil and Gas Platforms MRS Environmental, Inc MRS Environmental, Inc This study examined the potential environmental impacts from the use of heavy equipment for offshore oil and gas platform decommissioning in the Pacific Outer Continental Shelf (OCS) Region. This produced an in-depth analysis of the effects of those operations on regional air quality. Previous studies examined the air emissions impacts utilizing a general, order-of-magnitude approach appropriate for approximating the emissions from decommissioning. This analysis examines the air emissions to a permit-level-of-detail to examine the activities producing the largest impacts, as well as the feasibility and availability of mitigation strategies to reduce air emissions. A wide range of air emissions estimation inputs and calculation approaches were examined. The emissions levels as estimated in this assessment are substantial if higher-polluting equipment is used. However, use of clean diesel engines significantly reduces emissions from these activities. 105000 U.S. Department of the Interior, Bureau of Ocean Energy Management, Environmental Studies Program https://doi.org/10.13039/100012475 140M0118P0009 10.67297/9A1E0E https://boem.gov/awardpages/100238