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Indoor Air Quality

Indoor air quality (IAQ) is a term used to characterize the acceptability of the indoor air. Acceptability of indoor air is based on facts (results of investigation and/or testing) and the perception of the occupant.

Acceptable indoor air quality is defined by the American Society of Heating, Refrigeration and Air Conditioning Engineers (ASHRAE) as: "Air in which there are no known contaminants at harmful concentrations and with which a substantial majority (usually 80%) of the people exposed do not express dissatisfaction."

What affects our IAQ?

  • Asbestos
  • Lead
  • Biological Contaminants
  • Inadequate Ventilation
  • Chemical Contaminants from Indoors and Outdoors
  • Radon
  • Temperature
  • Humidity
  • Lighting
  • Noise
  • Odors

Guidelines and regulations are established by the Environmental Protection Agency (EPA), the Occupational Safety and Health Administration (OSHA), and the National Institute for Occupational Safety and Health (NIOSH).

These agencies have conducted numerous studies to evaluate the effects of constituents on individuals.

These are a consultants #1 resource for evaluating data generated from investigations and testing and help to determine what corrective actions (if necessary) must be taken to correct the issues.

The factors that determine IAQ can be broken down as follows. Click on the factors illustrated below for more information.

IAQ Sources Exposure Levels Health Effects

Sick Building Syndrome

When occupants experience health and comfort effects believed to be linked to the occupancy of a building it is known as Sick Building Syndrome.

Typically, no specific illnesses or causes can be determined and the occupants recover after leaving the building and symptoms resume upon their return.

This can be caused by any of the sources with exception of asbestos, lead and radon. Asbestos, lead and radon cause long term problems which occur years after exposure.


Speak to one of our project managers today by phone or e-mail for a confidential, no cost evaluation of your site.