I guess I have adverse reactions to ammonia
products and pretty much any household cleaner with chemicals in
it. Toxic mold can also create problems. My sister had recurring bronchitis and ear infections, as well did her 2 kids, several years ago when she rented a house that had a mold issue in their basement (they got out of it and immeddiately stopped having colds, infections, etc.). Another thing that I have heard that can cause problems is high CO (carbon monoxide) levels.