What does Indoor Air Quality (IAQ) primarily relate to?

Indoor Air Quality (IAQ) primarily pertains to the environmental conditions within and around buildings, focusing specifically on the air quality experienced indoors. This includes factors such as the presence of pollutants, humidity levels, temperature, and ventilation practices, which can affect the health, comfort, and productivity of the occupants.

The importance of IAQ is underscored by its direct impact on human health, as poor indoor air quality can lead to respiratory issues, allergic reactions, and various other health problems. Maintaining good IAQ involves controlling sources of indoor pollutants, ensuring adequate ventilation, and utilizing air cleaning techniques.

While the other options mention environmental conditions, they do not align with the specific emphasis on indoor spaces. Thus, while they may relate to broader environmental concerns, they do not define the realm of Indoor Air Quality as effectively as the focus on building-related environments does.