In what way can the age of a building affect its indoor air quality?

The age of a building can significantly affect its indoor air quality primarily due to the materials used in its construction and the systems integrated into its design. As buildings age, they may contain outdated materials, such as asbestos, lead-based paints, and volatile organic compounds (VOCs) from older insulation and finishes, which can off-gas and contribute to indoor air pollution. These materials can release harmful particles and gases over time, leading to a deterioration in air quality and potential health risks for occupants.

Additionally, older buildings may not have been built with modern standards for ventilation and air filtration, which can exacerbate the problem of indoor pollutants. Effective ventilation is crucial for maintaining good indoor air quality, as it helps dilute and remove pollutants while bringing in fresh air. Therefore, as buildings age, any deficiencies in these systems can make it difficult to manage air quality effectively. This gradual accumulation of detrimental materials and outdated systems is why the second option is the most accurate in explaining the relationship between a building's age and its indoor air quality.