NYC Mayor Releases 9/11 Air Quality Reports

New York City has released more than 170,000 pages of previously undisclosed records detailing what officials knew about air quality around Ground Zero following the September 11th attacks.

The documents were released Tuesday, just days ahead of the 25th anniversary of the attacks, and include internal memos, air-quality reports and environmental testing records from multiple city agencies. The records show that concerns about toxic substances, including asbestos and other hazardous chemicals, persisted in the months following the attacks. Some internal documents from October and November 2001 recorded elevated levels of toxins around Ground Zero, while officials publicly reassured New Yorkers that the air was safe.

New York City Mayor Zohran Mamdani announced the release, saying the records provide answers about what the city knew about the dangers at Ground Zero and when officials knew about them. The release includes what is known as the Harding Memo, which was sent to then-Deputy Mayor Robert Harding shortly after the attacks. The memo cited an estimate of about 35,000 potential plaintiffs who could bring legal claims against the city and discussed options for limiting the city’s legal liability.

Mamdani said the documents show that multiple mayoral administrations refused to release records that New Yorkers were entitled to see.
The release follows a lawsuit by the advocacy group 9/11 Health Watch seeking access to the records. The documents are now available through a searchable online portal, with additional records expected to be added in the coming months. The revelations come as the city prepares to mark 25 years since the September 11th attacks, which killed nearly 3,000 people. Thousands of first responders, survivors and others exposed to conditions at Ground Zero have since developed serious illnesses, including cancers linked to the World Trade Center site.

Mamdani said the city will also help eligible New Yorkers use the newly released records to support applications for federal health assistance.