Some Laser Printers May Be Hazardous to Your Health

Working near a laser printer might be as bad for you as second-hand smoke, according to a new study. Some major brands of printers emit particles of toner that can damage the lungs of people nearby—and even light concentrations can potentially cause heart and lung diseases.

The exposure level of nearby workers depends on the buildings ventilation, but the study found that a printer can increase indoor air pollution by five times. "We still have a great deal to learn regarding the consequences of indoor inhalation and ultra-fine particles," says an indoor air pollution expert. (More lung disease stories.)