Mamdani has made a statement about 9/11 records. He claims these records show a cover-up related to toxic air. The records in question consist of 170,000 pages of documents.

These documents contain various types of information, including air-quality reports and contamination data. They also include correspondence among city officials.

Further details about the records and Mamdani's statement are available from the source. The documents may provide insight into the events and decisions surrounding 9/11, but specific information about their content is limited.