NYC releases 170,000 documents showing city knew of toxic air after 9/11 but downplayed risks
Newly disclosed files reveal asbestos was detected near Ground Zero shortly after the attacks, contradicting official reassurances of air safety.
What happened
New York City released 170,000 documents on the 25th anniversary of the 9/11 attacks, resolving a lawsuit by 9/11 Health Watch. The files show toxic air quality, including asbestos, was being recorded in Manhattan near Ground Zero soon after the collapse of the Twin Towers, even as city and federal officials—including EPA head Christine Todd Whitman—declared the air safe. An October 2001 internal memo known as the "Harding Memo" warned Deputy Mayor Robert Harding that the city could face as many as 35,000 legal claims for its response to the attacks. Mayor Zohran Mamdani said the documents demonstrate what the city "knew about the toxic air around Ground Zero, when they knew it, and how they acted to limit liability." The city is allocating over $34 million to this document release effort, with more materials to be shared over the next year.
Context
Health effects attributed to 9/11 dust and smoke exposure have killed more people than the attacks themselves, according to U.S. health officials, with thousands experiencing illnesses including cancer. Survivors and advocates have spent years seeking transparency about the city's knowledge and response. The disclosed documents provide a factual record of the gap between what officials knew internally about air quality and what was communicated publicly, bearing on accountability for a public health issue whose health toll has extended decades beyond the initial attacks.