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• Spaces where the highest concentrations of contaminants are likely to occur . This could be due to the construction or fit-out of the space, a lower ventilation rate or air filtration level, the presence of combustion or operable windows, or occupant activities. For example, cafeterias may have a higher concentration of contaminants compared to classrooms, due to the presence of cooking.

  • Spaces occupied by at-risk populations or spaces designated for cleaner air . Consider placing monitors in areas where people who are more susceptible to poor indoor air quality congregate. For example, this may include spaces with infants, children, pregnant women, acute care facilities, and assisted living facilities.

  • If monitoring to support IAQ management during wildfires and prescribed burn events, review ASHRAE Guideline 44, Section 5.5.1.2 for considerations for monitor placement.

Monitors must be at a height corresponding to the breathing zone of a typical occupant. In most situations, the breathing zone is between three and six feet (0.9 and 1.8 meters) above finished floor height, based on the location of an occupant’s head when seated or standing. Alternative mounting heights based on the anticipated occupant position in a space may be considered.

Where possible, place sensors at least three feet (0.9 meters) away from doors, windows, air filters, air supply outlets, exhaust intakes, stoves, printers, and other potential airborne contaminant sources or sinks. In areas where this is not possible, locate monitors closer to air returns than air diffusers.

Monitors located in ducts do not meet the requirements.

MONITOR SPECIFICATIONS

Use indoor air monitoring devices that measure carbon dioxide (CO2), fine particulate matter (PM2.5), and total volatile organic compounds (TVOC). Monitors must meet the building grade requirements of RESET Grade B [105] or UL 2095 Grade B . Projects can use either permanent or temporary air monitors. Both types of air monitors must meet the reporting and tracking requirements for the credit.

Hourly reporting Monitors must report hourly PM2.5 and TVOC (or higher frequency) data and 15-minute CO2 data to a remote location that logs pollutant levels over time.

A digital display, or integration with the building management system, is not required to achieve the credit.

105 RESET Indoor Air Quality Monitors, n.d., reset.build/directory/monitors/type/indoor.

U.S. Green Building Council LEED v5 Reference Guide for Operations and Maintenance, April 2025 Launch Edition 225