Dangerous concentrations of hydrogen sulfide (H2S) have occurred through accidental release of sour natural gas from wells and pipelines (Layton et al. 1983). Local, terrain-influenced, meteor-ological conditions can control the seriousness of these events. In order to plan the development of H2S-contaminated natural gas fields in Wyoming, the U.S. Bureau of Land Management (BLM) had to identify areas where air quality impacts (dangerous concentrations) were likely, as well as those areas where they were unlikely. To accomplish this, a regional risk identification was performed for two Environmental Impact Statements prepared for the BLM's Kcmmerer, Wyoming, Resource Management Plan in 1985. In this analysis, map overlays of known H2S formations, geological hazards, population centers, and meteorological dispersion potential were compiled. This compilation was used to highlight areas where the air quality-related gas resource development risk is relatively high or low. Air resource modeling was conducted using component models of the Topographic Air Pollution Analysis System (TAPAS) developed by the U.S. Forest Service, the BLM, and the Colorado State University.