Industrial hygiene is the practice of identifying, evaluating, and controlling workplace stressors or hazards that can affect the health and safety of workers, their families, and those in the community.  These hazards fall into one or more categories and are referred to as either chemical, physical, or biological agents.  Ideally, hazards are identified and controlled when a workplace is planned through design reviews, when conditions or processes change, or through yearly reviews or surveys.  By identifying hazards before a worker is adversely affected, employers can proactively protect their employees and their families and prevent long-term health effects.  Most employers do