--- title: "LEED v5 Limits: CO₂, PM2.5, PM10, CO | Aethair" description: "LEED v5 O+M Indoor Air Quality Performance thresholds for CO₂, PM2.5, PM10, CO, and more, with averaging periods, points, and a recommended configuration." url: https://aethair.io/standards/leed_v5/ --- Compliance · US Green Building Council # LEED v5: Indoor Air Quality Performance (Operations and Maintenance) Indoor: green building certification (LEED v5 O+M) **LEED v5**, released by the US Green Building Council in 2025, rewards measured indoor air quality. In the Operations and Maintenance (O+M) rating system, the **Indoor Air Quality Performance** credit gives up to 10 points. Its continuous-monitoring option measures CO₂, PM2.5, and TVOC for at least three consecutive months (hourly, and every 15 minutes for CO₂) and awards points for results within its limits. **CO₂ at or below 1,000 ppm (95th percentile) earns 3 points, and at or below 800 ppm earns 4. PM2.5 at or below 15 µg/m³ (daily average) earns 3 points, and at or below 12 µg/m³ earns 4.** Monitoring TVOC earns 2 points at any level. [Schedule a call](https://calendly.com/d/ctdd-mkr-v9v/aethair-demo-website) [Configure LEED v5 Monitoring](https://aethair.io/build/?params=co2,pm2_5,pm10,co,o3,no2,ch2o,voc) At a glance **US Green Building Council** Indoor: green building certification (LEED v5 O+M) 8 parameters · 10 limit values [Carbon Dioxide (CO₂)](https://aethair.io/parameters/co2/) [PM2.5](https://aethair.io/parameters/pm2_5/) [PM10](https://aethair.io/parameters/pm10/) [Carbon Monoxide (CO)](https://aethair.io/parameters/co/) [Ozone (O₃)](https://aethair.io/parameters/o3/) [Nitrogen Dioxide (NO₂)](https://aethair.io/parameters/no2/) [Formaldehyde (CH₂O)](https://aethair.io/parameters/ch2o/) [VOC (Total)](https://aethair.io/parameters/voc/) 1 device measures them all - **Aethair PRO** Aethair MultiGas+ · Aethair O₃+NO₂ · Custom MultiSense [Official text from US Green Building Council](https://www.usgbc.org/resources/leed-v5-rating-system-operations-and-maintenance) The standard ## What LEED V5 Sets for Indoor Air Its one-time testing option sets limits of **9 ppm for carbon monoxide** (and no more than 2 ppm above outdoor), **50 µg/m³ for PM10, 12 µg/m³ for PM2.5, 0.07 ppm for ozone, 21 ppb for nitrogen dioxide, and 16 ppb for formaldehyde**, with TVOC above 500 µg/m³ calling for investigation. Limit values ## LEED v5 Limit Values Every value US Green Building Council publishes for the 8 parameters below, with its averaging period, as the standard states it. [**Carbon Dioxide (CO₂)** Gases & VOCs](https://aethair.io/parameters/co2/) **1000 ppm** *95th percentile, continuous* 3 points at or below **800 ppm** *95th percentile, continuous* 4 points at or below [**PM2.5** Particulate Matter](https://aethair.io/parameters/pm2_5/) **15 µg/m³** *Daily average, continuous* 3 points at or below **12 µg/m³** *Daily average, continuous* 4 points at or below; also the one-time test limit [**PM10** Particulate Matter](https://aethair.io/parameters/pm10/) **50 µg/m³** *One-time test* or ISO Class 8 per [ISO 14644-1](https://aethair.io/standards/iso_14644_1/) [**Carbon Monoxide (CO)** Gases & VOCs](https://aethair.io/parameters/co/) **9 ppm** *One-time test* and no more than 2 ppm above outdoor [**Ozone (O₃)** Gases & VOCs](https://aethair.io/parameters/o3/) **0.07 ppm** *One-time test* [**Nitrogen Dioxide (NO₂)** Gases & VOCs](https://aethair.io/parameters/no2/) **21 ppb** *One-time test* 40 µg/m³ [**Formaldehyde (CH₂O)** Gases & VOCs](https://aethair.io/parameters/ch2o/) **16 ppb** *One-time test* 20 µg/m³ [**VOC (Total)** Gases & VOCs](https://aethair.io/parameters/voc/) **500 µg/m³** *One-time test, investigate above* compare individual VOCs with health-based limits and take corrective action Who it applies to ## Who Uses It Owners and operators certifying existing buildings under LEED v5 O+M, and new construction projects under LEED v5 BD+C. BD+C projects demonstrate air quality through pre-occupancy testing or permanently installed sensors, rather than the flush-out that earlier versions allowed. Monitoring ## How Monitoring Demonstrates Compliance For the continuous option, the record is the monitoring data itself: at least three months within the reporting period, from monitors that are building grade or better, with CO₂ as the 95th percentile and PM2.5 and TVOC as daily averages. The same continuous record can support WELL v2 and ESG reporting. The configurator assembles a monitor for CO₂, PM2.5, and TVOC. [Customize this configuration](https://aethair.io/build/?params=co2,pm2_5,pm10,co,o3,no2,ch2o,voc) ### Who measures each parameter | Parameter | Aethair PRO | Aethair IAQ | External | | - | - | - | - | | [Carbon Dioxide (CO₂)](https://aethair.io/parameters/co2/) | CO₂ (dual NDIR), CO₂ (self-calibrating NDIR) cartridges | Built in | [2 instruments](https://aethair.io/parameters/co2/) via Thiamis | | [PM2.5](https://aethair.io/parameters/pm2_5/) | Built in | Built in | [3 instruments](https://aethair.io/parameters/pm2_5/) via Thiamis | | [PM10](https://aethair.io/parameters/pm10/) | Built in | Built in | [3 instruments](https://aethair.io/parameters/pm10/) via Thiamis | | [Carbon Monoxide (CO)](https://aethair.io/parameters/co/) | CO (electrochemical), MultiGas+ +1 cartridges | — | [3 instruments](https://aethair.io/parameters/co/) via Thiamis | | [Ozone (O₃)](https://aethair.io/parameters/o3/) | O₃+NO₂ cartridge | — | [1 instrument](https://aethair.io/parameters/o3/) via Thiamis | | [Nitrogen Dioxide (NO₂)](https://aethair.io/parameters/no2/) | NO₂, MultiSense +1 cartridges | — | [1 instrument](https://aethair.io/parameters/no2/) via Thiamis | | [Formaldehyde (CH₂O)](https://aethair.io/parameters/ch2o/) | MultiSense cartridge | Built in | — | | [VOC (Total)](https://aethair.io/parameters/voc/) | VOC (ppm PID), VOC (ppb PID) +2 cartridges | Built in | [2 instruments](https://aethair.io/parameters/voc/) via Thiamis | Devices ## Devices That Cover LEED v5 How much of this standard one Aethair monitor covers, followed by the third-party instruments in the sensor catalog that measure its parameters. Each connects to Environet through a Thiamis gateway, which adds whatever the monitor leaves out. Aethair monitors [**Aethair PRO** Built in + Aethair MultiGas+, Aethair O₃+NO₂, Custom MultiSense (CO₂, CH₂O) Covers all 8](https://aethair.io/products/pro/) [**Aethair IAQ** Built-in sensors 5 of 8: CO₂, PM2.5, PM10, CH₂O, VOC](https://aethair.io/products/iaq/) Covers part of it (combine on one Thiamis) [**RAE** Gas Detectors 4 of 8: CO, CO₂, NO₂, VOC](https://aethair.io/sensors/rae-gas-detectors/) [**TSI DustTrak** Particulate & Dust Monitors 2 of 8: PM10, PM2.5](https://aethair.io/sensors/tsi-particulate-dust-monitors/) [**Met One E-BAM** Particulate & Dust Monitors 2 of 8: PM10, PM2.5](https://aethair.io/sensors/met-one-particulate-dust-monitors/) [**Particles Plus** Particulate & Dust Monitors 2 of 8: CO₂, VOC](https://aethair.io/sensors/particles-plus-particulate-dust-monitors/) [**Trolex** Particulate & Dust Monitors 2 of 8: PM10, PM2.5](https://aethair.io/sensors/trolex-particulate-dust-monitors/) [**TSI GM460** Gas Detectors 1 of 8: CO](https://aethair.io/sensors/tsi-gas-detectors/) [**RKI Instruments GX6000** Gas Detectors 1 of 8: CO](https://aethair.io/sensors/rki-instruments-gas-detectors/) [**2B Technologies POM** Specialty Air Analyzers 1 of 8: O₃](https://aethair.io/sensors/2b-technologies-specialty-air-analyzers/) Solutions ## Solutions Judged Against LEED v5 ### [Indoor Air Quality](https://aethair.io/solutions/iaq-monitoring/) Offices, schools, homes, and public buildings [All solutions](https://aethair.io/solutions/) Article Library ## Articles on LEED v5 ### [How Building Certifications Use Air Quality Monitoring](https://aethair.io/resources/building-certifications-air-quality-monitoring/) How WELL and LEED v5 incorporate air quality monitoring, why both frameworks are moving toward continuous performance, and what that means for building teams. ### [Commercial Building IAQ Monitoring: ASHRAE 62.1 & WELL](https://aethair.io/resources/indoor-air-quality-monitoring-commercial-buildings/) Indoor air quality monitoring for commercial buildings: what to measure, which standards apply, and how property managers build a program tenants trust. ### [WELL Building Standard Air Quality: CO2 & PM2.5 Limits 2026](https://aethair.io/resources/well-building-standard-air-quality/) WELL v2 air quality limits: PM2.5 at 15 µg/m³, formaldehyde at 50 µg/m³, CO2 at 900 ppm for ventilation monitoring, plus the monitoring WELL verifies. ### [OSHA Air Quality Standards 2026: PELs & 29 CFR 1910.1000](https://aethair.io/resources/osha-air-quality-standards-compliance/) OSHA air quality standards for indoor and outdoor work: permissible exposure limits, Table Z-1, 29 CFR 1910.1000, and the heat and wildfire smoke triggers. ### [IAQ Monitoring Parameters: PM2.5, CO2, VOCs & Formaldehyde](https://aethair.io/resources/indoor-air-quality-monitoring-parameters/) Indoor air quality monitoring parameters explained: PM2.5, CO2, VOCs, and formaldehyde, plus the sensors, thresholds, and OSHA, ASHRAE 62.1, and WELL limits. [All articles](https://aethair.io/resources/) Questions ## LEED v5 FAQ How many LEED v5 points does continuous air monitoring earn? Up to 10 in the O+M Indoor Air Quality Performance credit: points for monitoring CO₂, PM2.5, and TVOC, and more for CO₂ at or below 1,000 or 800 ppm and PM2.5 at or below 15 or 12 µg/m³. What LEED v5 limit applies to CO₂? The 95th percentile of continuous readings at or below 1,000 ppm earns 3 points and at or below 800 ppm earns 4. What does LEED v5 require for one-time air testing? Limits including 9 ppm for carbon monoxide, 50 µg/m³ for PM10, 12 µg/m³ for PM2.5, 0.07 ppm for ozone, 21 ppb for nitrogen dioxide, and 16 ppb for formaldehyde.