Indoor air quality problems often masquerade as other health issues, making professional testing essential for accurate identification. Immediate symptoms include persistent headaches, eye and throat irritation, chronic fatigue, and difficulty concentrating that people often dismiss as stress or seasonal allergies. If multiple building occupants experience similar symptoms that improve when they leave the building, this suggests environmental contamination requiring investigation. Increased respiratory problems, frequent colds, skin irritation, and unexplained allergic reactions may indicate poor air quality. For businesses, increased employee sick days, complaints of stuffiness or odors, and productivity decreases often signal air quality issues that professional testing can identify and resolve.