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New York City on Tuesday began publishing more than 170,000 pages of previously undisclosed records on post-9/11 air quality, revealing that officials detected dangerous levels of asbestos and other toxins in Lower Manhattan within weeks of the attacks while publicly maintaining the air posed no threat. The documents, drawn from 68 boxes stored in a Department of Environmental Protection office and discovered only last year, include internal correspondence expressing concerns over potential legal liability from exposure, according to a New York Times review conducted in advance of the release. Mayor Zohran Mamdani directed the disclosure through a new online portal timed to the lead-up of the attacks’ 25th anniversary on Friday, with city officials confirming the files contain air monitoring data, contamination reports and communications among agencies that had remained shielded for more than two decades.
City Corporation Counsel Steven Banks stated in a briefing ahead of the release that the records provide clear indications officials knew there was a problem with air quality shortly after the towers collapsed. A memo addressed to a deputy mayor in the Giuliani administration listed potential grounds for lawsuits, including premature return of residents to contaminated areas and inadequate protective equipment for rescue workers, the documents show. Ten months after the attacks, testing still turned up asbestos half a mile from the site, contradicting repeated assurances from city and federal leaders that the air was safe, a sample of the records reviewed by The New York Times indicated.
The September 11th Victim Compensation Fund had received 9,780 claims for deaths linked to eligible 9/11-related conditions as of late August, a figure that now exceeds the nearly 3,000 people killed in the attacks themselves in New York, according to fund data. Advocates for first responders and survivors have long sought the records, arguing that early knowledge of risks could have altered cleanup practices and public warnings that left thousands exposed to carcinogens in the dust and smoke. An Environmental Protection Agency assessment completed in 2003 found that while the general population outside the immediate area faced limited long-term risk, those at Ground Zero in the first days encountered elevated concentrations of particulate matter, asbestos and other pollutants likely to cause respiratory harm.
The documents emerged following a lawsuit brought by 9/11 Health Watch against the city after officials initially claimed no such records existed within the Department of Environmental Protection. Benjamin Chevat, executive director of the advocacy group, secured a settlement that compelled the release of the 68 boxes, which attorneys described as having been effectively hidden for years. The discovery prompted the Mamdani administration to allocate $34 million in the current budget to process, review and publish additional materials from municipal and insurance offices over the coming year.
Mamdani addressed the release at a news conference, stating that as the years pass and the human toll grows, the city reckons with the cost of September 11th whenever another New Yorker is stolen from us too soon. He added that now, close to 25 years later, more people have died from 9/11-related illnesses than were killed on the day itself. The portal launch coincides with renewed focus on the environmental legacy of the attacks, including how initial EPA statements downplayed risks in the critical first days when fires continued to smolder at the site.
Additional records slated for future release include further environmental testing data from the Fresh Kills landfill where debris was taken and internal reviews that flagged benzene spikes near Ground Zero. A 2004 EPA evaluation later acknowledged uncertainties in exposure during the initial collapse and subsequent days, when monitors were not yet fully operational in all affected zones. City officials said the phased publication aims to balance transparency with necessary redactions while addressing demands from survivors, first responders and families affected by illnesses traced to the toxic dust.
