When I thought I was safe at home…. A study has been conducted by Queensland University of Technology into laser printers. It seems that some printers can emit dangerous ultrafine particles into the air.  A range of printers were tested, some with no emissions, some with low, medium and high emissions. Unfortunately, the brand of laser printer I use was not tested. I’m not taking any chances though. My office is small. Now I always open the window and leave the room whenever I print a document. You can read more about it on:

http://www.abc.net.au/science/articles/2009/02/12/2489916.htm

I downloaded a pdf of the original research paper which included the names of the printers but am unable to find it now on Google. I think you have to purchase it.