We don't think about them because they are invisible, often with little or no odor and they are in the products and furnishings we live with every day. The medical community knows very little about the health impacts of most daily chemicals. It knows even less about the impact of mixing airborne chemicals. We do know one thing, our bodies were not designed to process most of these synthetic concoctions. We pay far more attention to what we eat than what we breathe.
Some remedies are relatively simple.
When cooking, particularly with gas stoves, always use the exhaust fan. It is far better if the fan vents directly outside. If you have an attached garage, it should be vented with an exhaust fan on a timer connected to the remote control on the door. Every time the door opens or closes, the exhaust fan goes on for 10-15 minutes. If you are building or remodeling, try to eliminate particleboard from inside the house.