Mamdani Releases 9/11 Files Showing NYC Officials Feared 10,000 Injury Claims While Calling Toxic Air Safe

New York City has released more than 170,000 pages of records from the aftermath of the 9/11 attacks, revealing that city officials privately expected as many as 10,000 legal claims over toxic exposure while public statements repeatedly characterized air quality in Lower Manhattan as safe or acceptable.

Mayor Zohran Mamdani announced the release on Tuesday at a City Hall news conference, ahead of the attacks' 25th anniversary. The documents are now available through a public online portal.

Memo Warned of Legal Exposure

Among the files is an October 2001 memo sent to then-Deputy Mayor Robert Harding, titled 'Legislative Alternatives to Limit the City's Liability Relating to 9/11/01'. The memo cited a Law Department estimate of around 35,000 potential plaintiffs, with about 10,000 expected to actually file claims stemming from the attacks, and outlined legislative options to limit the city's legal exposure.

The memo raised concerns about how any resulting court cases might play out, warning that judges and juries could be sympathetic to plaintiffs and award substantial damages, even though officials believed the city had a strong legal defence. It also outlined potential grounds for lawsuits, including claims that health advisories caused people to return to the area too soon and suffer toxic exposure, or to stay away too long and face economic hardship.

Air Quality Findings Contradict Public Assurances

City officials said records already reviewed by the Mamdani administration show government leaders understood the dangers posed by burning toxins at Ground Zero even as the city publicly assured residents that conditions were safe. The documents include air quality reports, contamination data, and internal correspondence among officials.

Test results reportedly revealed asbestos in the area, while one document showed officials avoided the word 'risk' in public advisories. Another document reportedly acknowledged that the city may have given residents a dangerous recommendation when it advised them to use wet mops and rags to clean up asbestos dust at home, a guidance that raised concerns about whether residents were being asked to handle potentially contaminated material themselves.

Among the records are 68 boxes of documents that city officials say were only discovered last year. Their release resolves two lawsuits brought by advocacy group 9/11 Health Watch, which had sued the city to force publication of the files.

Reactions and Next Steps

'It would be one thing if the government had stood alongside survivors and provided them with everything they needed at every step of the way. And yet we know that could not be further from what actually happened,' Mamdani said. He added that 'the leaders they trusted lied and told them they were safe to breathe in toxic air.'

Speaking alongside the mayor, activist Jon Stewart said the records confirmed what many New Yorkers had long suspected, saying 'there was poison in the air and on the ground and on the windowsills and in your air conditioners,' and accusing officials of prioritising a return to normalcy over public health.

Steven Banks, the city's Corporation Counsel, said the release could lead to further litigation but that transparency outweighed those concerns.

The Mamdani administration said additional records will be reviewed, redacted, and released in the coming months. As part of the settlement, the city will also assign personnel at the Department of Citywide Administrative Services and New York City Public Schools to help New Yorkers obtain records needed to access federal health and compensation programs.