Indoor Air

Exponent offers considerable experience across multiple practices and disciplines on a wide range of indoor air issues. Our experience encompasses sampling, modeling, exposure and risk assessment, and other investigation and assessment services.

Examples of services provided by Exponent in the indoor air arena include:

  • Assessments of indoor air contaminant levels via sampling and/or modeling
  • Building ventilation evaluations in industrial and residential settings
  • Studies of cigarette smoke concentrations in indoor environments and associated risk assessments via sampling and modeling
  • Modeling studies using analytical box models and computational fluid dynamic (CFD) modeling techniques
  • Source characterizations and emission rate estimations for products used in indoor environments
  • Indoor environmental quality assessments for green building design or certification
  • Investigations of indoor areas for issues such as moisture and water intrusion, mold, and nuisance or noxious odors 
  • Vehicular in-cabin evaluations of odor
  • Dose reconstruction and risk estimation for human exposure to substances in the indoor air environment, including fumes from off-gassing from building materials, rugs, furniture, and dust
  • Vapor intrusion evaluations and risk assessments to support:
    • Superfund analyses
    • Litigation concerning claims of exposure or property damage from vapors originating from contaminated ground water and soil
    • Proactive reviews of prospective or already implemented vapor intrusion mitigation methods
Example Projects

Exponent provided technical support in estimating pollutant concentrations inside a baking facility. Combustion gases were accidentally escaping, entering the oven’s baking zone, and then accumulating within the bakery. Exponent modeled the concentration spatial distribution within the bakery and the decay with time associated with indoor dilution due to HVAC air exchange, turbulent eddy diffusion, and reflections by walls, floors, and ceilings to estimate concentration.

Exponent modeled a potential leak of effluent gases in the basement of a building to estimate concentrations of ozone and formaldehyde. Concentrations were estimated based on an indoor air quality box model that accounted for leak and ventilation rates.