New York City published roughly 170,000 pages of its own September 11 records on Tuesday, opening a searchable public portal that survivors and first responders spent years suing to obtain. The files cover air quality, health concerns, and the city's response after the World Trade Center collapsed, and they landed three days before the 25th anniversary of the attacks.
The release is a legal and political story. It is also a medical one, and the medical part is not finished. Federal data published this spring show the illness curve from that dust still bending upward, and the group climbing fastest is not the one most Americans picture when they think about 9/11 health effects.
Inside the Files the City Fought for Years to Withhold
The Mayor's Office announced the initial release alongside a settlement of two lawsuits brought by the advocacy group 9/11 Health Watch. The batch includes the frequently referenced Harding Memo, a collection of records concerning World Trade Center 7, and the 68 boxes of material the city says were not located until 2025 despite multiple Freedom of Information Law requests. The records portal is live now.
Corporation Counsel Steven Banks described the material as "documents that were never previously made available to the public." Speaking at the same event, Daily Show host and longtime advocate Jon Stewart said: "There was poison in the air, and on the ground, and in the windowsills, and in your air conditioners."
Mayor Zohran Mamdani's fiscal 2027 budget includes $34 million to build and maintain the portal. The Law Department says it will keep posting records over the next 12 months after removing personally identifiable information, and expects substantially more to follow.
The underlying dispute is old. A 2003 evaluation by the EPA Office of Inspector General examined how the agency handled its public statements about air quality in Lower Manhattan and how it could respond better to a future disaster. What City Hall itself knew, and when, has never been documented from City Hall's own files until now.
Cancer Has Overtaken Every Other Certified Condition
The health ledger sits with the federal World Trade Center Health Program, created under the James Zadroga 9/11 Health and Compensation Act. Its most recent quarterly program summary, covering data through March 31, 2026, counts 143,340 people currently enrolled. Two-thirds of them, 67 percent, have been certified for at least one 9/11-related health condition.
Over the life of the program, cancer certifications now total 54,956 members. That is more than chronic rhinosinusitis at 42,302, gastroesophageal reflux disease at 39,099, asthma at 23,085, and post-traumatic stress disorder at 17,985.
The trend line is the striking part. Of 15,377 conditions certified in the most recent 12 months, 10,622 were cancers. Non-melanoma skin cancer leads the list at roughly 17,670 certified members, followed by prostate cancer at about 12,600, female breast cancer at about 4,660, and melanoma at about 3,700. The program paid out $348.37 million in approved medical claims over the past year.
The CDC labels these figures preliminary and subject to refinement, and notes that the program does not track cause of death for members who die.
The People Told It Was Safe to Come Back Are Now the Larger Group
Here is the number that reframes the anniversary. Across the program's lifetime, 27,726 cancer certifications belong to survivors, and 27,230 belong to responders. Survivors have edged ahead.
In the most recent 12 months, the gap is wider: 6,124 cancer certifications among survivors versus 4,498 among responders.
In program terms, survivors are people who lived, worked, attended school, or cleaned contaminated buildings in the disaster area. They are the civilians who were told the air was fine and who went back to their apartments, offices, and classrooms. They are also a minority of program membership, with roughly 55,300 enrolled survivors compared with about 88,000 responders, which makes their share of new cancer certifications disproportionate.
Two things explain part of that shift without explaining all of it. Most cancers only became covered conditions in October 2012, and uterine cancer was added in January 2023, so certifications lag exposure by design. Survivor enrollment has also grown faster in recent years than responder enrollment.
One point deserves emphasis. Certification is an administrative determination that 9/11 exposure was substantially likely to have been a significant factor in causing, contributing to, or aggravating a condition. It is made by a program physician and approved by the program. It is not proof that 9/11 caused any individual person's cancer, and these counts are not incidence rates.
Paperwork Is the Bottleneck, and the City Just Released a Lot of It
The portal will not settle causation for anyone. What it can do is more mundane and more immediately useful.
Both federal 9/11 programs require applicants to document that they were physically present in the New York City exposure zone. City records, including school and employment files, are frequently the only surviving proof. The Mamdani administration says it will assign staff at the Department of Citywide Administrative Services and at New York City Public Schools specifically to help people retrieve those records for the health program and the September 11th Victim Compensation Fund.
That matters because the program is still taking on new members, with 2,081 enrolled in the first quarter of 2026 alone, and because incomplete documentation is by far the leading reason applications stall. In the past year, insufficient documentation suspended the applications of 2,536 survivor applicants and 1,667 responder applicants.
Anyone who lived, worked, or attended school in Lower Manhattan in the months after the attacks and has never been screened can contact the World Trade Center Health Program directly. Anyone with new or worsening respiratory symptoms should raise their exposure history with a clinician rather than wait for a document search to conclude.
Key Questions Answered
What did New York City actually release?
About 170,000 pages of city records on air quality, health concerns and the government response after September 11, posted to a new public portal. The city says more will follow over the next 12 months.
Do the documents prove officials lied?
The city has released the files, not a finding. Elected officials and advocates say the records show what was known internally while the public was reassured. Independent review of the full set has not yet occurred.
How current are the health numbers?
The World Trade Center Health Program figures cited here run through March 31, 2026, and were published on May 1, 2026. The CDC describes them as preliminary.
Why do survivors now have more certified cancers than responders?
Survivor enrollment has grown faster in recent years, and cancer coverage has expanded over time. The counts reflect certifications, not measured cancer rates in either group.
Does a cancer certification mean 9/11 caused that cancer?
No. Certification means a program physician determined exposure was substantially likely to have been a significant factor, and the program approved it. It is not individual proof of causation.
Who can still enroll?
Responders and survivors who can document presence in the New York City exposure zone. The city is assigning staff to help people locate school and employment records supporting those claims.
