Chemicals in workplace

Patient: Hello. I work in a small company near a couple of factories and my desk is right by the bathroom. Sometimes a strong smell comes out of the toilet or drain and it makes my eyes burn a little. I asked the owner of the company what it was and he said it was methane and that it was safe. But now that I am pregnant I have been asking other people and they told me that the building had to be evacuated a couple of times last year because of chemicals from a factory that makes energy drinks. What chemical could it be and should I stop coming to work?

Symptoms: Irritated eyes, headache, foul smell

Doctor: