This document is the final report for U.S. Department of the Interior, Minerals Management Service (MMS), Gulf of Mexico Outer Continental Shelf (OCS) Region, contract number 1435-01-01-CT-31065, "The SO2 and NO2 Increment Analysis for the Breton National Wilderness Area (BNWA)." This section provides background information about the study, a discussion of increments for Class I areas, as defined in the Clean Air Act, a summary of objectives, and summaries of the methods and findings from the episode-type study.