Steven BanksJerry NadlerZohran MamdaniChristine Todd WhitmanMichael BloombergRudolph GiulianiBenjamin ChevatRobert HardingJon StewartNew York City Department of Investigation9/11 Health WatchNew York City Department of Environmental ProtectionWorld Trade Center Health RegistryUS Environmental Protection Agency

NYC Mayor Mamdani releases 170,000 pages of undisclosed 9/11 files showing officials knew air was toxic but told public it was safe; 25th anniversary Friday

New York City Mayor Zohran Mamdani has unveiled over 170,000 pages of documents revealing that officials were aware of toxic air conditions post-9/11 but assured the public it was safe. This release coincides with the 25th anniversary of the attacks that killed nearly 3,000 people.

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In a significant disclosure, New York City Mayor Zohran Mamdani released over 170,000 pages of documents revealing that city officials misled the public about air quality following the September 11 attacks.1912

The documents indicate that officials were aware of toxic air conditions, including asbestos and other contaminants, yet continued to assure residents that the air was safe.7

"These are documents that show what the city knew about the toxic air around Ground Zero, when they knew it, and how they acted to limit liability," Mamdani stated.

The release coincides with the 25th anniversary of the attacks, which resulted in the deaths of 2,977 people. Since then, over 9,400 individuals have died from illnesses linked to their exposure to the toxic environment, according to federal health data.2

Advocacy group 9/11 Health Watch played a crucial role in obtaining these documents through legal action. Their director, Benjamin Chevat, criticized past administrations for withholding critical information, stating, "For 25 years, four different Mayoral administrations kept from the public... documents showing what the City actually knew about the danger of the toxic chemicals."8

The files include air-quality reports and communications among city officials, revealing that asbestos was found "nearly everywhere" near Ground Zero.

Former Mayor Rudolph Giuliani had previously assured the public of air safety, despite acknowledging the presence of unpleasant odors.

Mamdani emphasized the long-term health impacts, noting, "more people have died from 9/11-related illnesses than were killed on the day itself."

Key Insight
“The documents include the Harding Memo, which warned of up to 35,000 potential legal claims, and show asbestos was found 'nearly everywhere' near Ground Zero. More than 9,400 have died from 9/11-related illnesses, and the city's Department of Investigations is now probing what officials knew.”
New documents suggest New York City officials misled residents about air quality after 9/11 attacks
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CuriousCats studied:
1
ABC News & Headlines – Australian Broadcasting CorporationABC News & Headlines – Australian Broadcasting Corporation
“New York City Mayor Zohran Mamdani has released more than 170,000 pages of documents showing city officials did not disclose all they knew about air toxicity after the September 11, 2001, attacks.”
ABC News & Headlines – Australian Broadcasting Corporation →
2
BBCBBC
“Toxic air quality was being recorded in Manhattan soon after the 9/11 attacks even as officials played down health risks to the public, according to a trove of newly released files.”
BBC →
3
The IndependentThe Independent
“New York City Mayor Zohran Mamdani released more than 170,000 pages of internal records Tuesday that show officials misled people about the safety of the air around Ground Zero after the .”
The Independent →
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