batch_auto_20260713 202607131256465730 BOEM ESP geoESPIS ESPIS@boem.gov Bureau of Ocean Energy Management Air Quality Modeling In The Gulf of Mexico Region Eastern Research Group, Inc. Eastern Research Group, Inc. Under the OCS Lands Act (OCSLA), BOEM is required to prescribe regulations for compliance with the National Ambient Air Quality Standards (NAAQS) to the extent that OCS oil and gas exploration, development, and production sources significantly affect the air quality of any state, including Texas, Louisiana, Mississippi, Alabama, and Florida. Air quality modeling is conducted to assess the existing pre- and potential post-lease impacts from OCS oil and gas development to the states. BOEM uses this information in National Environmental Policy Act (NEPA) environmental impact statement (EIS) cumulative and visibility analyses. This study used a new, more sophisticated model that supports the current NAAQS. BOEM will also use information from this study to assess post-lease impacts using emission exemption threshold (EET) formula screening methods to determine whether a proposed source will cause or contribute to a violation of the NAAQS. 154295 U.S. Department of the Interior, Bureau of Ocean Energy Management, Environmental Studies Program https://doi.org/10.13039/100012475 M0119F0019 10.67297/9A1FB7 https://boem.gov/awardpages/100663