855773520-LEED-v5-ID-C-Reference-Guide-Launch-Edition-1 - Page 363

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all instruments must meet the minimum specifications of Table 2. Alternative methods may be used for Path 1 contaminants if the project team documents that the accuracy and resolution specifications in Table 2 are met.

PATH 2. VOLATILE ORGANIC COMPOUNDS

A screening test for TVOC and test for each individual VOC in Table 3 must be performed at each measurement location.

Because VOC testing and analysis is complex, it must be performed using specific methods by a laboratory that is accredited under ISO/IEC 17025 [151] for the test method used.

TVOC screening is intended to serve as a general indicator of the VOC levels in the building and is used to capture situations where investigation of individual VOCs beyond those targeted via Table 3. of the rating system may be needed. While projects are not required to meet a specific TVOC threshold, they are required to report TVOC results. If the TVOC concentration exceeds 500 ug/m3, the team must work with the laboratory to compare the individual VOC levels from the GC/MS results to associated cognizant health-based limits and perform corrective actions as necessary.

Option 2. Continuous Indoor Air Monitoring

During occupancy, airborne contaminants can enter a building from the outdoors or be introduced by indoor sources and activities such as cleaning, cooking, use of candles, 3D printers, or improperly vented heating appliances. Permanently installed continuous indoor air monitors enable the identification of potential issues and timely corrective actions to assure systems designed to maintain IAQ in the building continue to work as intended through the project’s operational phase.

Number of monitors A successful monitoring strategy must consider the data collection purpose and dedicated resources for ongoing data management. Fewer well-managed monitors are usually more beneficial than numerous neglected monitors. Include at least one monitor per 25,000 feet (2,500 square meters) of total occupied floor area. This density is a good entry point for getting started with IAQ monitoring. Additional monitors can be added as desired up to the best-practice density of one monitor per 5,000 square feet (500 square meters) of total occupied floor area.

151 ISO/IEC 17025, https://www.iso.org/ISO-IEC-17025-testing-and-calibration-laboratories.html

U.S. Green Building Council LEED v5 Reference Guide for Interior Design and Construction, April 2025 Launch Edition 352