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1Source Safety and Health is now part of TRC, a leading national provider of engineering and consulting solutions supporting a clean energy future. Learn more.

Providing professional consulting and expert testimony in the areas of:

Indoor Air Quality

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12/10/2021 - Construction Safety & Health Programs

Construction sites include a large number of hazards for workers and those nearby. Safety management at TRC helps to oversee the daily activities that take place around construction projects both ...

LEED Indoor Environmental Quality Testing

Leadership in Energy and Environmental Design (LEED) rates a building's environmental impact. A LEED-certified building uses a lower number of resources than average and promotes a healthy interior space. In the context of indoor air quality (IAQ), a LEED-certified space takes measures to ensure good IAQ through:

  • Ventilation: Natural or HVAC ventilation provides an adequate supply of fresh outdoor air to remove contaminants generated by occupants and processes.
  • Pollutant and contaminant reduction: A LEED-certified building design aims to reduce contaminant sources generated by building materials and furnishings and cleaning chemicals.
  • Filtration and cleaning: Proper filtration removes contaminants from outdoor air that comes inside, improving IAQ.

Our consultants can identify opportunities to improve a building in these ways and more, before and during construction.

Pre-Construction LEED Strategies

The strategies that 1Source's LEED consultants recommend may include:

  • HVAC protection: Protecting HVAC systems from structural weaknesses, malfunctions and hygiene issues
  • Source control: Mitigating contaminant sources such as building and furniture materials
  • Pathway interruption: Obstructing pathways for contaminants from the outdoors or other areas
  • Housekeeping: Developing housekeeping plans that reduce exposing chemical vapors
  • Scheduling: Integrating a flush-out into the building's construction plan to remove residual contaminants

1Source consultants understand how to work with a variety of facility types and can customize a LEED strategy to meet your organization's needs.

Construction IAQ Management Plans for LEED's Certification

At 1Source, our experts can assist with two types of LEED-based plans for acceptable IAQ. Whether you request EQ credits for LEED certification or use LEED as a guideline, we can create:

  • Construction IAQ management plans during construction: Strategies related to the building's construction, such as construction practices, HVAC systems, building structure and building layout
  • Construction IAQ management plans before occupancy: Plans related to the building's interior and operations, including furniture materials, housekeeping plans, interior layouts and pre-occupancy flush-out

You may combine these strategies to ensure compliance with LEED standards throughout each step of the construction and pre-occupancy process. Our specialists can develop a comprehensive plan for maintaining acceptable IAQ.

LEED's Air Quality Testing

Certified industrial hygienists (CIH) can manage air quality testing for documentation and verification. These tests measure the maximum concentrations of contaminants outlined in LEED standards. The samples taken by our CIH team depends on your space's square footage and the number of air handlers in the area. Our CIH team members can perform testing related to the following contaminant limits:

  • Formaldehyde: 27 parts per billion
  • Ozone: 0.075 parts per million
  • Particulates (PM10): 50 micrograms per cubic meter of air
  • Particulates (PM2.5): 15 micrograms per cubic meter of air
  • Total volatile organic compounds: 500 micrograms per cubic meter
  • Carbon monoxide: 9 parts per million (ppm), or no greater than 2 ppm above outdoor levels
  • Target volatile organic compounds: 35 specific compounds
Contaminant Maximum Concentration


27 parts per billion


0.075 parts per million
Particulates (PM10) 50 micrograms per cubic meter of air
Particulates (PM2.5) 15 micrograms per cubic meter of air
Total Volatile Organic Compounds 500 micrograms per cubic meter
Carbon Monoxide 9 parts per million (ppm), or no greater than 2 ppm above outdoors levels
Target Volatile Organic Compounds 35 Specific Compounds

After performing on-site readings and laboratory sample testing, our CIH team will generate a report of their discovered results. You may then use the documents for your records or as part of the LEED certification process.

Request a Quote for LEED Testing

To learn more about LEED air quality testing from 1Source, request a proposal today.

Request a Quote from 1Source