I subscribe to Consumer Reports magazine. In the June 2012 edition, there was a feature article on indoor air quality. It talks about all the regular stuff: mold, radon, carbon monoxide, VOCs, etc.
What I found interesting is that the Consumer Reports National Research Center performed a survey to ascertain the importance of indoor air quality to the US consumer. What percent of Americans do you think considered indoor air quality to be a threat to their health?
A paltry 9% considered it be a threat to health. Furthermore, an astounding 70% weren’t concerned about indoor air quality at all! If everyone understood how the indoor environment affect health, more than 9% would consider it to be an important threat.