With management like that, I'd say it's time for a new job.
Otherwise, drop a note to OSHA, as well as the local EPA. I am sure that there ought to be some solvent / fume recovery in place, and it is very possible that there is an issue with the electrical.
Zone classification is made by "competent authority." This is typically the Fire Marshal, an expert from the insurance carrier, or a QUALIFIED Professional Engineer. Likewise, the ISA (Instrumentation Society) folks are experts in this area.
Whatever the situation, there ought to be plenty of professional documentation of the process. Again, if this is lacking, your place is probably so poorly run that it's time to leave.
