This project is intended to provide designated branches of the Hawaii Department of Health with technical support, training, and advice regarding the planning and performance of epidemiologic investigations to assess potential public health concerns. The specific issue currently being addressed is the continuing eruption of the Kilauea volcano on the island of Hawaii, and the potential for respiratory health effects in children living downwind of the volcano. To provide needed exposure assessment, two ground-based monitoring stations have been established. These exposures will be linked to measures of morbidity and mortality in Hawaiian children.