As Far as Possible
You should keep photocopiers as far away from workers as possible because photocopier toner contains toxic chemicals such as selenium and give off ozone, also known as smog, according to the Transport Salaried Staffs' Association.
Separate, Well-Ventilated Room
Instead of a specific distance away from workers, you should keep photocopiers in a separate, well-ventilated area, according to the Workers Health Centre website. In addition, you should monitor the air quality of photocopier rooms for toxic chemicals and ozone.
Ideally, you want to keep a photocopier as far away from workers as possible in a separate room, according to Rice University. Also, try to avoid giving tasks to workers that send them to the photocopier excessively, or rotate photocopier-intensive tasks among your employees.