Key post-9/11 air toxicity information was kept secret for 25 years

New York Mayor Zohran Mamdani released tens of thousands of previously undisclosed documents on Tuesday detailing city officials' knowledge of toxic air following the September 11 terrorist attacks. The disclosure comes as the 25th anniversary of the attacks approaches.

The newly released files shed light on information that was kept secret for a quarter-century regarding post-9/11 air toxicity. The release also highlights the ongoing health crisis, as thousands of individuals continue to suffer from illnesses related to the toxic conditions.