I have serious problems with many of the same chemicals as GP. Well I understand different ones are harmful or not in theory, I only know what I react to. It's almost uniformly products to which artificial fragrances are added intentionally, or exhaust that's known to be harmful such as diesel and gasoline. I only have issues with certain natural fragrances (essential oils) with extended exposure or large amounts. Most likely it's members of several large categories that I react to. Could be VOCs, phthalates, teflon relatives, and synthetic fragrance compounds.

Like gluten intolerance, one of the difficult things about reacting negatively to common consumer products is the number of people who refuse to believe it's a real problem.