12. We cannot protect workers if we are not aware of the hazards they may encounter in certain situations, if we do not monitor their health, and if we do not conduct medical screening. During the aftermath of the Pentagon being hit by the commercial jet on 9/11, industrial hygienists went through the stabilized sections of the disaster site and conducted air sampling looking for toxic materials. Under the Occupational Health Surveillance function this would have been:

1. Hazard Surveillance
2. Medical Surveillance
3. Medical Screening
4. Case Identification