Health Issues
Contact to ultraviolet light is a concern. In the early days of photocopiers, the sensitizing light source was filtered green to match the best possible sensitivity of the photoconductive surface. This filtering conveniently removed all ultraviolet. Presently, arrays of light sources are used. As glass spreads ultraviolet rays between 325 and 400 nanometers, copiers with ultraviolet-producing lights such as fluorescent, tungsten halogen, or xenon flash, expose documents to some ultraviolet.
Worry about emissions from photocopy machines have been spoken by some in connection with the use of selenium and emissions of ozone and fumes from heated toner. However, these concerns may be due to misunderstanding or exaggeration.