Which factor does NOT influence Indoor Air Quality?

Indoor Air Quality (IAQ) is predominantly influenced by factors that either directly affect the air within the space or contribute to pollutants and allergens. The correct choice indicates that external noise levels do not have a significant impact on IAQ.

While noise can certainly affect the comfort and psychological well-being of occupants, it does not change the chemical composition or particulate matter in the air. In contrast, building architecture plays a critical role in ventilation and air circulation, determining how effectively air flows and pollutants can escape. Climate control systems are essential for regulating temperature and humidity, which can affect the growth of mold and the presence of various airborne contaminants. Housekeeping practices also directly impact IAQ by removing dust, allergens, and potential chemical pollutants from the environment.

Therefore, external noise levels, while relevant to the overall comfort of a space, do not have a direct effect on the quality of the air breathed by occupants.