Had a colleague who complained for years that sitting next to the breaker box made him ill from all the EMR.
When I moved to his desk it didn't pass my stringent cleanliness standards so I started cleaning.
I pulled the desktop computer out of it's corner and found - and I am not making this up - a basketball-sized dust-bunny nestled on the desk at face-level.
Gotta watch out for that unhealthy EMR. Much more dangerous than plain-old dirt.