Caption title. At head of title: Project Summary. "Sept. 1985." "EPA/600-S8-82-003f."

Methyl chloroform (MC) is a volatile chlorinated hydrocarbon used extensivley as an industrial solvent and in consumer products. It has been detected in the ambient air of a variety of urban and non-urban areas of the United States. Normally, background levels are in the range of 0.1 to 0.2 ppb (0.54 x 10p-3s to 1.08 x 10p-3s mg/mp3s). MC has been less frequently detected in water, generally at levels of 1 ppb or less. In certain instances involving contamination of groundwater, much higher levels have been reported. The weight of available evidence obtained from both human and animal data suggests that long-term exposure to environmental levels of MC poses no serious health concern to the general population. However, the available data are inadequate for classifying the mutagenic and carcinogenic potential for MC. The no-observed-effect level (NOEL*) for short-term exposure of humans is in the range of 350 to 500 ppm (1,890 to 2,700 mg/mp3s).