title: Ozone production from photocopying machines.
abstract: Ten photocopying machines of different makes and models were tested for ozone emissions. All but one produced detectable amounts. Concentrations at operator's breathing zone varied from less than 4 to 300 micrograms/m3, which corresponded to emission rates of less than 1 to 54 micrograms/copy. Servicing reduced emissions to less than 1.4 micrograms/copy, but preservicing levels were retained after several weeks of operation.
mesh_terms: D000393:Air Pollutants / Q000032:analysis; D003308:Copying Processes / Q000295:instrumentation*; D010126:Ozone / Q000032:analysis*
chemical_list: D000393:Air Pollutants; D010126:Ozone