City releases 9/11 air‑quality records, showing officials knew Ground Zero air was unsafe

New York City has published more than 170,000 pages of previously undisclosed air-quality records from after the September 11, 2001 attacks, showing officials knew the Ground Zero air was unsafe even as they publicly assured New Yorkers it was safe. Mayor Zohran Mamdani unveiled a searchable portal ahead of the 25th anniversary, noting the ongoing toll of 9/11‑related illnesses and urging outreach to more residents who lived near the site. The Harding Memo is among the documents, revealing anticipated lawsuits and steps to limit liability. Activists and survivors, including 9/11 Health Watch, have pressed for transparency for years, and the release aims to shed light on the city’s post‑attack response.