Laser printers pollute office air

Study for fine particulates that can get deep into the lung. No pattern of make or model (most of the printers tested were HP, though) for high emitters.

Detailed examination of some high emitters revealed some statistically weak influences that may be confounding factors. The age of the toner cartridge had an influence on both amounts of particulates produced and their average size. Page coverage also played a role, as the jump between a print that covered five percent of the page to one that covered 50 percent roughly doubled emissions.