According to a new study out, certain laser printers emit enough tiny particles that they may rival plumes of second-hand cigarette smoke. It sounds like there’s a lot more research that needs to be done, but this definitely deserves more attention. We have 3 HP printers that are listed in as “high-level emitters” – the 4200dtn, 4250dtn, and the 5550dtn. Of course, HP is doing damage control.