Among the machines that had no emissions were eight HP LaserJet 4050 series printers and four Ricoh Aficio models.
High emitters included the HP LaserJet 1320 and 4250, which, when printing, increased the particle number in the air more than tenfold.
The study did not consider variables such as printer age or cartridge type, leading to variations even among printers of the same model. The scientists noted that they found one HP LaserJet 5 to be a high emitter, while another was a non-emitter.
Among the machines that had no emissions were eight HP LaserJet 4050 series printers and four Ricoh Aficio models.
High emitters included the HP LaserJet 1320 and 4250, which, when printing, increased the particle number in the air more than tenfold.
The study did not consider variables such as printer age or cartridge type, leading to variations even among printers of the same model. The scientists noted that they found one HP LaserJet 5 to be a high emitter, while another was a non-emitter.