An oil refinery proposed for a South Dakota site near Sioux City poses a threat to air quality in northwest Iowa, I recently learned from Dr. Jim Redmond, chair of the Sierra Club’s Northwest Iowa Group. The Hyperion Energy Center would be the sixth-largest oil refinery in the country. It would emit large quantities of several pollutants, including particulate matter 2.5, which is hazardous to human health.

The South Dakota Department of Natural Resources (DENR) and the South Dakota Board of Minerals and Environment have issued a preconstruction air permit to the Hyperion Energy Center. Unfortunately, the permit omits relevant information. For instance, instead of using five years of data on ambient air conditions in Sioux Falls and Sioux City, only one year of information for Sioux Falls was used. The environmental impact on Sioux City (25 miles downwind from the proposed facility) will certainly be greater than on Sioux Falls (50 miles upwind).

The Environmental Protection Agency (EPA) criticized the draft air permit for the Hyperion project, but South Dakota’s DENR did not incorporate their suggestions.

Because the Hyperion project will adversely affect air quality in and around Sioux City, Iowans should contact the EPA administrator in Region 7 (containing Iowa). South Dakota lies in the EPA’s Region 8.

Redmond sent me extensive background information on this matter and sample letters to the EPA, which I’ve posted after the jump.