A massive secret trove of 9/11-related New York City records were released Tuesday, revealing city leaders potentially misled the public about toxic air risks in the aftermath of the terror attacks 25 years ago.

Nearly 170,000 pages of records — including a bombshell October 2001 memo showing city officials knew about potential Ground Zero risks — detailing health and air quality concerns are now publicly available in an online portal.

The release — which stems from a settlement of two long-running lawsuits by the 9/11 Health Watch watchdog group — represents a hard-fought victory for advocates who raised alarms over air toxins after the World…

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