What can be used as a budgeting metric for the IAQ Credit regarding low-emitting materials?

The correct choice highlights that a budget calculation based on compliant products serves as a budgeting metric for the Indoor Air Quality (IAQ) Credit pertaining to low-emitting materials. This is because assessing costs directly related to products that meet specific low-emission criteria allows project teams to ensure that they are prioritizing materials that contribute positively to indoor air quality. Evaluating the budget in this way helps in planning and reinforcing the commitment to sourcing materials that minimize volatile organic compounds (VOCs) and other harmful emissions.

In contrast, while natural light can contribute to overall building quality and occupant comfort, it does not directly pertain to low-emitting materials requirements. The cost-effectiveness of building materials may reflect broader considerations but does not specifically address the need for compliance with the IAQ standards. Similarly, energy savings over time relates more to operational efficiency and sustainability outcomes rather than the specific accounting necessary for tracking low-emitting material investments.