LASER PRINTERS and breathing problems

Laser printers emit a lot of toner dust, which contains carbon and solvents, and quite a few people are sensitive to it. You can smell it when the printer is on, and especially on freshly printed paper. You may notice wheeziness, coughing, sneezing, etc. Some acquaintances at copy centers and service bureaus complain of headaches, and suspect the toner dust. I haven't personally seen any studies, so I don't know for sure, but err on the side of caution. NCR paper ('carbonless' paper) can also cause wheeziness. Good ventilation, drawing air away from the operator, seems to be the answer.