First responders who worked at Ground Zero want to know who knew what about the dangers of toxic dust in the days after 9/11. Congressional hearings began in lower Manhattan Friday to address medical care for chronically ailing 9/11 volunteers and workers. Steven Centore, of Flanders, who worked in and around Ground Zero says he developed an illness and was not able to get the health care he needed. The story is similar for John Sferazo, of Huntington Station, who also developed major health complications. Christie Todd Whitman, the former head of the Environmental Protection Agency, was the most frequent target during the daylong hearing. Whitman declared in the days after 9/11 that the air in lower Manhattan was safe. She defended herself Friday, insisting that it was up to local authorities to make sure the rescue workers wore protective breathing gear.Health and Human Services Secretary Michael Leavitt told lawmakers that $75 million would be delivered in the next two months to pay for treatment programs. Related Information: Direct link found between 9/11 recovery work and long-term respiratory problems