Former NFL player Joe Andruzzi's three brothers, Jimmy, Billy and Mark, all served as New York City firefighters the day the planes hit the Twin Towers. ABC News' Michael Strahan has their story.
It's estimated 400,000 people were exposed to toxins, risk of physical injury and stressful conditions from 9/11 and the aftermath, according to the WTC Health Program.
ABC News spoke with first responders about illnesses linked to dust, smoke and debris exposure at ground zero 25 years later-- and their fight for benefits.