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Mamdani releases 170,000 pages of 9/11 air-quality records; reporting raises questions about disclosure

Mamdani has released 170,000 pages of documents related to air quality after the Sept. 11 attacks, and separate reporting says New York did not fully disclose what officials knew about ‘toxic air.’

By James Barber • September 9, 2026 · 6:41 am
Mamdani releases 170,000 pages of 9/11 air-quality records; reporting raises questions about disclosure

The Guardian reports that Mamdani has released roughly 170,000 pages of records related to the impact of the Sept. 11 attacks on air quality.

Those documents, according to The Guardian, focus on the environmental and public-health consequences of the attacks and the aftermath at Ground Zero.

Separately, The Straits Times reports that New York failed to disclose what it knew about so-called “toxic air” after 9/11, citing documents and reporting related to the same topic.

Together, the releases and reporting have spotlighted questions about what information existed and how it was shared in the years following the attacks. The newly released records and contemporaneous coverage provide fresh material for public and health officials, researchers, and families seeking a clearer record of those events.