EM testing

Does any one on this list do or know of a place doing environmental EM testing?

I suppose a Google and Amazon hit(s) would yield DIY results but I prefer experience.

Ive been having a situation were various parts of the building seeming to drain batteries and sack out cell phones more then others.

Im always trying to champion the env that artists work in like sneaking in HEPA style filters on our AC units throughout the facility and doing frequent vent/duct cleaning.  ne time I even scheduled down time for the entire facility to do a major cleaning.

Any ways thanks in advance,