A 20-year battle to unearth what NYC knew about the dangers of the 9/11 toxins swirling around Ground Zero in the weeks after the terror attacks is reaching a major turning point.

Eight weeks after being ordered to launch a detailed review, the city’s Department of Investigation is now preparing to receive “volumes of data” on the subject from city agencies, the Daily News has learned. Once the City Council mandated the DOI to hunt for documents on 9/11 toxins in mid-July, the agency sent out letters to every agency, asking them to identify and turn over any relevant documents they had.

The response they received has been so overwhelming that the DOI may need to contract with an outside investigations agency to parse through all the data.

Nearly all of the agencies contacted have respon

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