Which measurements are included in developing a building's IAQ profile?

• A. Temperature and humidity only
• B. Humidity and CO2 only
• C. Airflow, temperature, RH, CO2
• D. Airflow and temperature only

Answer: (C)

The key idea is that an IAQ profile is built from multiple measurements that together reveal how air moves and how comfortable and safe occupants are. Airflow shows where air is circulating, where supply or exhaust may be lacking, and where contaminants could stagnate. Temperature affects comfort and, together with humidity, influences how people perceive air quality and how certain pollutants behave. Relative humidity matters for comfort and for microbial growth or chemical offgassing, while carbon dioxide provides a practical indicator of ventilation effectiveness relative to how many people are present. Elevated CO2 tells you the outdoor air change rate isn’t meeting occupancy needs, even if other conditions seem fine. When you combine airflow, temperature, RH, and CO2, you get a fuller picture of the indoor environment than you would with any subset. The other options miss one or more of these critical measurements, so they don’t fully characterize the IAQ profile.