International Indoor Air Quality Institute

International Indoor Air Quality Institute (IIAQI) Healthy IAQ Certificate Standards
For Commercial Properties and Spaces

Standards Index


The institute stands firmly behind its commitment to achieving excellence in indoor air quality. The institute’s unwavering dedication is evident in the rigorous standards it upholds, which serve as the bedrock for certifying and evaluating commercial spaces. Whether it’s a state-of-the-art new construction, a venerable building, or a meticulously renovated or retrofitted area, our guidelines and benchmarks apply universally.

Our approach to certification achievements is primarily quantitative, relying on measurable metrics. However, for specific grades (please refer to section Commercial Certificates), we adopt a dual approach that combines both quantitative and qualitative assessments. This nuanced approach takes into account certain conditions and factors that contribute to overall air quality.




  • Multinational Organisations
  • Small to Medium Companies 
  • Co-working Spaces (Business Hubs)

Educational Institutions and Hospitality: 

  • Schools
  • Daycares and Day Homes
  • Hotels, B&Bs
  • Cottages, and Airbnbs


  • Energy Upgrade Companies
  • Manufacturers
  • Medical Centers
  • Retirement Homes 
  • Yoga and Meditation Studios
  • Renovations & retrofits
  • New Houses and Apartments
  • Energy Retrofitted Homes
  • Renovated Homes
  • Rental properties
  • Real estate Investments  (Built To Rent, Student Accommodation)
  • Social Housing

Standards for Residential Properties »


The Institute undertakes a meticulous process to assess and certify indoor spaces. Its commitment to optimal air quality extends to commercial environments. This goal is achieved through Comprehensive Assessments, where the institute carefully evaluates a wide range of pollutants present in these spaces. By doing so, we actively promote good indoor air quality practices, ensuring healthier environments for all commercial premises.

We aim to contribute to the following aspects:

  • Public Awareness and Education:
    • Raise awareness among building occupants, facility managers, and the public about the importance of IAQ.
    • Educate stakeholders on the impact of IAQ on health, productivity, and overall well-being.
    • Provide information about best practices for maintaining good IAQ.
  • Trust and Transparency:
    • Establish trust by ensuring that IAQ-related information is accurate, transparent, and accessible.
    • Communicate openly with building occupants, addressing any concerns related to IAQ.
    • Regularly share IAQ monitoring data and improvement initiatives.
  • Opportunity for Improvement:
    • Create opportunities for continuous improvement in IAQ.
    • Encourage regular assessments of IAQ performance.
    • Implement measures to enhance IAQ, such as adequate ventilation, air filtration, and pollutant control.


Parameters Measured

For our Healthy IAQ Certificates for commercial properties and spaces, these parameters need to be measured:

  • Carbon Dioxide (CO2)
  • Carbon Monoxide (CO)
  • Formaldehyde (HCHO)
  • Nitrogen Dioxide (NO2)
  • Ozone (O3)
  • Particulate Matter (PM) PM2.5, PM10
  • Volatile Organic Compounds (VOCs)
  • Radon (Rn)
  • Temperature
  • Humidity


For the performance targets policy for each parameter above, please check Performance Targets Policy Guidelines Per Parameter Measured section

Placing IAQ Monitors for Commercial Properties and Spaces Certification

IIAQI Assessments for certifications for commercial projects, new and old premises must be able to demonstrate that the air in the breathing zone of the building occupants adheres to IIAQI performance targets.

In order to adhere to IIAQI standards, IAQ monitors must be installed according to the following requirements:

  1. Monitors must be placed centrally to the room. Hence, for assessment and certification purposes, the IAQ monitors cannot be placed in corners of a room, nor can they be placed under windows or vents. 
  2. Must be located at least 5 metres (16 feet) away from air filters and fresh-air diffusers. In areas where this is not possible, monitors must be located closer to air returns than air diffusers.
  3. Monitors must be placed within the breathing zone: 90cm – 180cm (3-6 feet) from the ground.
  4. IAQ devices must be located at least 5 metres away from operable windows (16 feet). When this is not possible, monitors must be placed no closer to windows than half the width of the space, measured linearly from the windows inwards.
  5. Floor Plans are required to determine the area size, regularly occupied space types and occupant coverage.
  6. Every step needs to be documented with notes and photographs that will corroborate with the standards applied and contribute to producing reports and certifications.

Occupants Coverage

The IIAQI requires that the IAQ monitors used for the certification assessment cover a minimum of 75% of the occupancy rate.

Occupants include tenants, employees (full and part-time as well as maintenance and cleaning staff), clients, customers, guests and visitors.