“An estimated 400,000 people were exposed to toxic contaminants, risk of physical injury, and physically and emotionally stressful conditions in the days, weeks, and months following the attacks. Responders who worked on the rescue, recovery, and relief efforts reported a range of illnesses soon after the attacks. Survivors who lived, worked, and attended school in Lower Manhattan, some who remained throughout and some who returned to their lives in the disaster area, started reporting illnesses as well. estimated 400,000 people were exposed to toxic contaminants, risk of physical injury, and physically and emotionally stressful conditions in the days, weeks, and months following the attacks. Responders who worked on the rescue, recovery, and relief efforts reported a range of illnesses soon after the attacks. Survivors who lived, worked, and attended school in Lower Manhattan, some who remained throughout and some who returned to their lives in the disaster area, started reporting illnesses as well.”

Centers for Disease Control and Prevention – CDC  (https://www.cdc.gov/wtc/exhibition/toxins-and-health-impacts.html)