As building envelopes get tighter, air flow through the building is choked off and VOCs and allergens are trapped inside homes. In light of concerns about the amount of formaldehyde found in Lumber Liquidators’ products (which only violated California standards), more home buyers are going to be concerned about the level of air quality in their new living spaces. Here’s what you need to know about indoor air quality and how you can make your homes healthier and your customers happier.