IAQ is defined by a set of ever-changing factors, including outside air quality, weather, building operation, type of mechanical systems inside the building, contaminants that may be present, and the types of occupants in the building. Building use can also be a factor. Buildings that are designed for one purpose often end up being used for something entirely different. The new use may be incompatible with the original building design, and if the building owners are unaware of the need to adjust building design or operation to account for the new use, IAQ problems can result.

Most experts group all of these interrelated factors into the following four primary factors that are common to every IAQ problem in every climate. This infographic summarizes these four factors. You can also download a copy of our moisture and mold manual here – Free Manual Download