New York City Releases 170,000 Pages of 9/11 Air-Quality Records

Since the September 11, 2001 attacks, first-responders, residents, and advocacy groups have pressed for full disclosure of the city’s air-quality monitoring. Lawsuits and FOIA requests uncovered dozens of boxes of hidden documents. In early September 2026, Mayor Zohran Mamdani signed two executive orders (September 4, 2026) authorizing public release of these records.

CNN

On September 8 2026, Mayor Mamdani announced at City Hall that more than 170,000 pages of air-quality reports, contamination data, and internal correspondence from the weeks and months after the attacks are now available through an online portal. The files, stored in 68 boxes discovered the previous year, include memos from the Giuliani administration that detail concerns about toxic dust, asbestos, and potential legal liability while the public was told the air was safe.

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• 170,000+ pages of records released.

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• 140,000 individuals are enrolled in the World Trade Center Health Program.

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• 49,000 people have been diagnosed with certified WTC-related cancers.

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• Nearly 6,000 deaths have been attributed to 9/11-related illnesses according to 9/11 Health Watch.

NYC Mayor Mamdani releases thousands of long-sought city documents on 9/11 air quality

• A memo dated October 2001 (“Harding Memo”) shows officials were aware of liability risks while publicly declaring safety.

The Source

Mayor Mamdani said the city owed “transparency and accountability” to families, survivors, and first responders, emphasizing that the records reveal how officials balanced health concerns with potential lawsuits. City officials noted the data will help the public understand environmental hazards in Lower Manhattan and may inform programs established under the Zadroga Act. Corporation counsel Steven Banks acknowledged the documents could prompt future litigation but argued that openness outweighs those risks.

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Activist Jon Stewart, speaking alongside the mayor, accused the city of prioritizing a rapid return to normalcy over health protections, stating that “there was poison in the air and on the ground and in the windowsills and in your air conditioners.” He argued that city leaders “lied” about safety, contributing to long-term illness among responders and residents.

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• Stewart estimates “almost 10,000 people” have died from 9/11-related illnesses, while 9/11 Health Watch reports “nearly 6,000” deaths.

NYC Mayor Mamdani releases thousands of long-sought city documents on 9/11 air quality

• The released documents represent only a fraction of the air-quality reports generated after the attacks; the full scope of monitoring data remains undisclosed.

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• “Close to 25 years later, more people have died from 9/11-related illnesses than were killed on the day itself,” — Zohran Mamdani

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• “We’ve lost three times as many people to 9/11-related illnesses as we did on 9/11 -- three times as many -- almost 10,000 people,” — Jon Stewart

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• “The very least our city owes the families, survivors and first responders whose lives were forever changed by the horrific terror attack of September 11 is transparency and accountability,” — Zohran Mamdani

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• “The leaders they trusted lied and told them they were safe to breathe in toxic air,” — Zohran Mamdani

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• “There was poison in the air and on the ground and in the windowsills and in your air conditioners,” — Jon Stewart

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City officials indicated that additional records will be reviewed, redacted, and posted in the coming months, expanding public access to the full archive of environmental data and internal communications related to the 9/11 response.

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