LEED v5 O+M Rating System_February 2026 - Page 074

Extracted Content

• Carbon dioxide (CO2): 95th percentile value

  • PM2.5: Daily average

  • TVOC: Daily average in units of parts per million or micrograms per cubic meter

AND/OR

Option 2. Targeted One-Time Air testing (1–3 points)

Test for parameters listed in Table 2 at least once during the 12-month reporting period. Include a concurrent measurement of outdoor ambient air quality within the project boundary for reference comparison.

One point is available for testing and meeting the minimum IAQ limit for every two parameters listed in Table 2, for a total of up to 3 points. Use one of the allowed test methods listed in Table 2. One-time Air testing. Project teams may use laboratory-based or direct-read test methods.

Table 2. One-Time Air Testing

Parameter	Concentration Limit (µg/m3)	Allowed Test Methods	Col4
**Parameter **	Concentration Limit **(µg/m3) **	Laboratory-Based	Direct-Reading Instrument Minimum Specifications
Carbon monoxide (CO)	9 ppm and no more than 2 ppm above outdoor levels	ISO 4224 EPA Compendium Method IP-3 _GB/T 18883-2002_for projects in China	Direct calibrated electrochemical instrument with accuracy of ±3% of reading and resolution of 0.1 ppm NDIR CO sensors with accuracy of 1% of 10 ppm full scale and display resolution of less than 0.1 ppm
Particulates: PM 10	ISO class 8 or lower per ISO 14644-1:2015 OR meet 50 μg/m3	IP-10A	Accuracy (±): Greater of 5 μg/m3 or 20% of reading Resolution (±): 5 μg/m3
Particulates: PM2.5*	ISO class 8 or lower per ISO 14644-1:2015 OR meet 12 μg/m3	IP-10A	Accuracy (±): Greater of 5 μg/m3 or 20% of reading Resolution (±): 5 μg/m3
Particulates: PM2.5*	OR, for projects located in an area where the national standard or guideline for PM2.5 is exceeded, meet35 μg/m3	OR, for projects located in an area where the national standard or guideline for PM2.5 is exceeded, meet35 μg/m3	OR, for projects located in an area where the national standard or guideline for PM2.5 is exceeded, meet35 μg/m3
Ozone	0.07 ppm	ISO 13964 ASTM D5149-02	Monitoring device with accuracy greater of 5 ppb or 20% of reading and

U.S. Green Building Council LEED v5 Reference Guide for Operations and Maintenance, November 2025 Edition 68