Most of us underestimate the health impact of our day to day decisions. If you use commercial cleaning products in your house, you are probably breathing in stuff that is bad for your health.
If you're concerned about the environment in your home, there is a great database from the National Institutes of Health at http://householdproducts.nlm.nih.gov/ where you can learn what is in most of the products you use to clean your home. Some of it is pretty scary - you're breathing in a lot of undesirable stuff when you clean your sink, wash your dishes, or scrub your bathroom. But it's better to get educated than not....