Indoor environment quality (IEQ) refers to the quality of the environment within a specific built structure that impacts its occupants’ health and well-being. Factors that impact IEQ include temperature, lighting, air quality, acoustics (sound), and relative humidity (RH). There are commercially available portable and/or digital sensors that measure these factors. Some devices measure a combination of these factors. There are even free smartphone and tablet apps that are able to do this albeit on a less accurate scale compared to dedicated devices.