We use in-depth interviews, participant observation, and document analysis to examine perceptions of environmental health and justice among Native Americans in a rural Oklahoma community. Residents live near the Continental Carbon Company, which manufactures a rubber compound know as "carbon black." Ponca tribal members believe their respiratory problems and other health concerns are directly related to the black dust emanating from the facility, but they have been unable to validate their health claims through institutional channels. We examine how Native American respondents interpret the environmental pollution as a threat not only to their health and well-being but also to their sense of community. We address the perceived pattern of institutional denial and highlight the obstacles facing an impoverished Native American community attempting to validate their environmental health claims.