Indoor Air Quality

The goal of diagnosing an IAQ problem is to identify the cause of the problem and implement an appropriate solution. Often, more than one problem can exist, requiring more than one solution.

For this reason, The IAQ diagnostic process begins when a complaint is registered or an IAQ problem is discovered. Many problems can be simple to diagnose, requiring a basic knowledge of IAQ and some common sense.

Not all occupant complaints about IAQ are caused by poor indoor air. Other factors such as noise, lighting, and job, family, or peer-related stress can—individually and in combination—contribute to a perception that IAQ is poor.

http://www.epa.gov/iaq/schools/tfs/guide2.html