Current and former firefighters sue sirenmaker over their hearing loss

There were times by the end of his shift that firefighter Joseph Nardone's head would be pounding, his eyes crossing from the noise of the siren on his truck.

"The siren was so loud inside the cab that it actually physically hurt," said the former New York City fire battalion chief. Even though he's been retired for over a decade, he said, the effects of the sirens linger in hearing loss that has left him unable to understand rapid conversation or follow along in church.

Nardone is among about 4,400 current and former firefighters nationwide who are suing Federal Signal Corp, an Oak Brook, Illinois-based company that makes sirens, claiming it didn't do enough to make them safer for those on fire trucks who have to listen to them nearly every day.