A LEEDuser member provided the following input received from GBCI in February 2019:

“As LEED v4.1 is in a Beta phase, when conducting the IAQ testing, project should adhere to the requirements available at the time of the testing. Refer to the EQ Prerequisite: Indoor Environmental Quality Performance for currently available requirements within the LEED O+M Guide. At this time, the LEED v4.1 rating system does not currently include a minimum number of testing locations. The guidance does state the following: "Take the indoor air measurements in locations representative of all occupied spaces, within the breathing zone (between 3 and 6 feet (900 and 1800 millimeters) above the floor), during normal occupied hours, under typical minimum ventilation conditions." As such, the testing locations do need to be representative of all occupied spaces. It is common for teams to include a testing location on each floor of the building. Project teams should provide the Indoor Air Quality evaluation report, including a narrative explaining how test locations were determined, time and dates testing was performed and floor plans highlighting test locations.”