How many categories of low-emitting materials are available for earning points in the IAQ Credit?

The correct answer indicates that there are three categories of low-emitting materials to earn points under the Indoor Air Quality (IAQ) credit in LEED BD+C V4. These categories are essentially designed to address various types of materials that impact indoor air quality, focusing on reducing the amount of harmful emissions within the building.

The first category encompasses adhesives and sealants, which are often used in finishes and construction. The second category includes paints and coatings, which can emit volatile organic compounds (VOCs) and contribute to indoor air pollution. The third category consists of flooring systems, which can also emit harmful substances and affect air quality over time.

By covering these three distinct categories, LEED encourages project teams to select materials that comply with stringent low-emission criteria, thus supporting healthier indoor environments. Additionally, focusing on multiple categories allows greater flexibility for achieving the required points while promoting a holistic approach to indoor air quality.