New York City releases 170,000 pages of 9/11 air-quality documents

New York City disclosed 170,000 pages of documents related to air quality and health concerns following the September 11, 2001 attacks, Mayor Zohran Mamdani said at a news conference on Tuesday. The release, which includes internal memos from 2001 and 2002, is intended to provide transparency about the city’s response and potential legal exposure.

One memo, addressed to then-Deputy Mayor Robert Harding, warned that the city could face up to 10,000 lawsuits over “toxic exposure” and suggested strategies to limit liability, such as seeking federal indemnification. Another internal document expressed concern that criticism from a congressional representative could lead to “major public relations problems” and a surge of lawsuits.

Advocacy group 9/11 Health Watch, which pursued the lawsuit that prompted the disclosure, praised the action. Its executive director, Benjamin Chevat, said the records show that city officials were aware of hazardous substances, including asbestos, yet continued to assure the public that air quality was safe.

"Administration after administration has ignored those calling for answers and clarity, instead choosing to bury them in legal arguments and in red tape," Mamdani said.

"We will do no such thing," he added, pledging to release additional documents over the coming year.

Survivors and advocates, including comedian Jon Stewart, attended the briefing. Stewart noted that the release could help ensure better access to health care for affected residents and first responders.

The CDC estimates that about 400,000 people were exposed to hazardous dust and fumes after the attacks, and the World Trade Center Health Program reports more than 4,300 related illness deaths to date. The newly released files may prompt further legal actions against the city for alleged withholding of information.