"I fear that this is only the tip of the iceberg. There were approximately 400,000 students, teachers, residents, office workers, responders and volunteers in Lower Manhattan on 9/11, and during the eight months following the attacks, when the air was thick with carcinogens. Unfortunately, only 80,000 have registered with the WTC Health Program, which provides free annual medical screenings and health care to those certified with 9/11-related illnesses. Should these screenings detect cancers or other illnesses, survivors are eligible for compensation and long-term health care."