The terms you want to Google for are:

"MSDS Ammonia" or "Ammonia MSDS"

"MSDS" stands for "Material Safety Data Sheet" -
the way Industries warn of the dangers of the chemicals they produce.

Here's one for Ammonia that is worded pretty well >>>
http://www.chem.tamu.edu/class/major...sdsammonia.htm

IF you get "fired" over a health issue -
CALL your local Health Department and ask them to "visit" the store
to determine if there is a high level of Ammonia in the area you worked in.

/s/ Phred