A Look at the Health Toll of 9/11, 25 Years After the Attacks

As the 25th anniversary of Sept. 11 approaches, New York Mayor Zohran Mamdani released a trove of previously undisclosed government documents about the attacks.
The records show the air around Ground Zero was far more toxic than publicly known, linked to thousands more deaths from exposure.
NBC's Valerie Castro highlights the revelations in this week's Sunday Focus, sparking renewed attention and questions about the government's response.