I know I'm quite poorly if I spend any time near photocopiers - I think they give off ozone and "particulates" 
 
 
I know I wouldn't last an hour in most modern offices - the unbaffled fluorescents give you an instant headache, then you've got all the lovely photocopier fumes, usually mixed with leechates from the foams used in the furnishings and carpets, with a hefty lashing of synthetic fire-retardants
(just in case the first lot didn't get you!) - windows carefully sealed, you are then provided with over-dry "air" laden with the toxic substances used in the air conditioning to lessen the chance of legionella............. 
 
 
I'm surprised anyone survives! 
 
 
Then you've got all those useful "radio" devices - phones, internet routers, mobile 'phones pinging high energy radio waves about 

http://solarwind.org.uk - a small company in Sussex sourcing, supplying, and fitting alternative energy products. 
Amateurs encouraged - very keen prices and friendly helpful service!