Mayor Bloomberg killed a study on the city's response to the 9/11 attacks after his lawyers said they did not want a report that cited any missteps or dealt with "environmental" or "respirator issues," says a former city official.

City lawyers raised fears that the proposed "after-action report" - which the U.S. Department of Justice had offered to fund - could lead to criticism and fuel lawsuits, David Longshore, former director of special programs for the city's Office of Emergency Management, told The Post.

"The Bloomberg administration acted to sweep any potential problems under the rug," said Longshore, who was trapped in a loading dock outside the WTC while both towers collapsed. He later developed sinusitis and throat polyps and sued the city.

Longshore, who left his city job last year, showed The Post his work notes on internal OEM discussions with city lawyers in February 2003. His notes say the Law Department "doesn't want a critical report" and "does not want a report that says we did anything wrong."