Laser Printers More Toxic Than Cigarette Smoke

Emissions from office laser printers can be as unhealthy as cigarette smoke, according to an Australian professor who is now calling for regulations to limit printer emissions.
Office workers breathing easy since smoking was banned in public places in the U.S. and U.K. can start worrying again, according to research from the Queensland University of Technology's Air Quality and Health Program, led by physics professor Lidia Morawska.

The average printer releases toner particles that can get deep into the lungs and cause respiratory problems and cardiovascular trouble, according to Morawska's team, part of the International Laboratory for Air Quality and Health, and specialists in atmospheric particles.
The team tested 62 laser printer models--all relatively new--and found that 17 of them were "high emitters" of toner particles. Despite using similar technology, office photocopiers do not emit particles, the team found.

The particles have not had a full chemical analysis, but some are potential carcinogens, according to a report in The Sydney Morning Herald. Several of the high emitters were Hewlett-Packard LaserJet models, such as the 1320 and 4250, although eight HP LaserJet 4050 series printers were shown to have no emissions, according to reports.

The printer-emissions data were discovered by chance when an investigation of office ventilation systems, carried out jointly between the university and the Queensland Department of Public Works, found five times as many particles indoors as those produced by traffic outdoors. Using an electronic sniffer, researchers traced the emissions to printers. The emissions were found to increase during the day, when printers were left on standby or in full operation.