regulation of perchloroethylene dry cleaning facilities mariel kusano abstract the primary solvent in process majority cleaners united states is a man made organic classified as hazardous substance under california hazard communication standard due to its health hazards and possible carcinogenic properties occupational safety administration cal osha regulates workplace 8 hour 25 ppm permissible exposure limit pel this study identified regulatory through phone interviews with consultation area offices compared industry respect all environmental regulations set by protection agency epa other industries that use correlations comparisons data from sector notebook project i hypothesized would be regulated less stringently having fewer frequent inspections than abundance decentralized nature determined tested only after an employee complaint or employer request comparison between various on