Dangerous contaminants settled indoors and outside, but government officials quickly encouraged a return to normal life. On Sept. 18, 2001, the Environmental Protection Agency said air quality tests in lower Manhattan revealed no excessive levels of asbestos or other harmful substances.

Memorial tributes flood in today as the nation remembers the harrowing 9/11 attacks from twenty five years ago.

Secret government memos show city officials knew within weeks of the September 11, 2001, attacks that the air around Ground Zero was dangerously toxic — even as they publicly assured residents, rescue workers,

Tough choices had to be made in the aftermath of the Sept. 11, 2001, terror attacks, including when it would be safe to reopen Lower Manhattan.

FDNY unions will respond today to newly released 9/11 records that raise new questions about toxic air exposure at Ground Zero.