In general, most refineries today are quite safe, no matter whether you're in the plant or the office. There are a few exceptions, however, but these are usually clandestine cash operations in the sticks that hide from EPA, OSHA, IRS, local fire dept inspections, etc. Usually, the larger and more visible the refinery is, the safer it will be. In today's world, they are forced by gov agencies to spend the money be safe - either that or go out of business. I've worked, in the plant, usually, of about 20, or more, big and small, refineries over the past 45 years, and I really don't think this has affected my health in any way. In fact, I have this crazy idea that smelling a small amount of acid fumes daily has helped to kill the bad crap in my system. I'm 71, get checkups every 6 mos, and don't have a damned thing wrong with me, that I know of (knock on wood). At least, they never seem to think I need any medication. I worry a lot more about things that surround us, like fluoridation, pesticides, fertilizer, etc. Were I you, I would probably jump at the opportunity. Too bad you'll be stuck in the office. Lots more fun in the plant.