Where in home building do risk and doubt converge? In indoor air quality matters, that's where. For big builders, the dilemma about indoor air quality falls somewhere on the spectrum of what they must do to be in compliance with code, what they could do to be ethical, and what they'd be smart in doing to avoid future liability. Add in a hefty cost factor that plays havoc with internal rate of return models, and you've got a doozey of an issue. That is where indoor air quality is right now.