Which term describes the attributes of the respirable air inside a building (indoor climate), including gas composition, humidity, temperature, and contaminants?

• A. The perceived indoor experience of energy efficiency
• B. A formal and ongoing record of problems
• C. Attributes of the respirable air inside a building (correct)
• D. The change in enthalpy due to humidity

Answer: (C)

Understanding indoor climate means looking at what the air inside a building is like—the gases present, humidity, temperature, and any contaminants. Those elements together define indoor air quality, which is why describing the air’s attributes is the exact way to capture the indoor climate. The option phrased as describing the attributes of the respirable air inside a building is correct because it directly references the properties that make up indoor air quality. The other ideas touch on related concepts (comfort from energy efficiency, a problem log, or a single thermodynamic change) but don’t describe the full set of air characteristics that define the indoor environment.