For the first time, a seventh moment of silence will be observed to honour the thousands who have died since 2001 from illnesses tied to the toxic dust that poisoned the air for months afterward.

A seventh moment of silence at the September 11 ceremony at Ground Zero will honor those lost to diseases and other health effects from 9/11.

The 2001 attacks unfolded across New York, Virginia, and Pennsylvania, killing nearly 3,000 people and permanently changing American life.