Yes, carbon is released during the printing process. All HP Inkjet and LaserJet printer platforms are tested during development for airborne emissions. The concentrations of ozone, volatile organic compounds and particles anticipated to be generated under expected conditions of use are consistently below worldwide occupational health standards, and are frequently below stringent indoor air quality guidelines. Many of HP's printers have been qualified as "low-emitting" products under the German Blue Angel and US GREENGUARD ecolabel programs.
As a good practice in maintaining a comfortable work environment, printer systems should be installed in well-ventilated areas. In addition, it is important to select media (papers), toners and inks that have been characterized and are recommended for use with the system (refer to your user's manual).