Jon Stewart criticized New York City officials after Mayor Zohran Mamdani released more than 170,000 pages of previously undisclosed records about 9/11 air quality, saying the city “covered it up to get back to business as usual.”
Stewart spoke at a news event tied to the document release and said it was “very clear that the city knew,” accusing officials of hiding what they learned about toxic conditions after the September 11, 2001 attacks, according to a CNN video of his remarks.
The release came when Mamdani’s administration opened an online portal containing the tranche of municipal records. The Guardian reports the documents were published three days before the 25th anniversary and that the release followed a settlement of lawsuits brought by 911 Health Watch.
The newly released files include internal memos and city correspondence about post‑9/11 air monitoring and a memo in which city lawyers weighed possible liability, The Guardian reports. Officials and advocates say the records add evidence that residents and responders were told the air was safe when some internal documents showed concern about toxic exposure.
Advocates praised the portal as a first step toward answering “what did the city know,” while Mamdani said the documents show New Yorkers were misled, per The Guardian. The release also arrives during commemorations of the attacks; local reporting notes the timing just ahead of the 25th anniversary.

Legal advocates including 911 Health Watch said the portal followed a settlement that forced the city to provide long‑sought records, according to The Guardian. Those groups have long argued that access to municipal testing and internal communications is necessary to understand long‑term health consequences for first responders and residents.
Why this matters: Stewart’s public rebuke and the city’s document release have renewed scrutiny of long‑running health claims tied to Ground Zero and revived calls from families and advocates for accountability and transparency ahead of the anniversary.
For reporting on the anniversary and related political fallout, see local coverage of the 25th anniversary and family demands for declassification in our site archive.
25th anniversary tributes and 9/11 families’ declassify push offer related coverage on the commemoration and records demands.
Sources
- CNN — video and transcript of Jon Stewart saying officials “covered it up” after the release of 170,000 pages.
- The Guardian — reporting that Mayor Zohran Mamdani opened an online portal with more than 170,000 pages, described the settlement with 911 Health Watch, and cited internal memos about liability.












