PITTSBURGH -- The nation's largest radio broadcasting company is enacting a zero-tolerance policy aimed at keeping indecent material off the air, and the effects are already being seen locally.

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Clear Channel Communications said it will put in place a policy that includes automatic suspensions for anyone who regulators allege has committed on-air violations.

The company also said contracts with on-air personalities are being altered to make sure that disc jockeys share financial responsibility if they put indecent material on the air.

Clear Channel has six stations in Pittsburgh: 94.5, 96.1, 102.5, 104.7 and 105.9 on the FM side, and 970 AM.

As a result of the new policy, Howard Stern's weekday morning show will no longer be heard at 105.9 FM. Clear Channel suspended the program at all of its stations because a caller used a racial slur during an interview with a man from Paris Hilton's widely distributed sex tape.

"Clear Channel drew a line in the sand today with regard to protecting our listeners from indecent content, and Howard Stern's show blew right through it," according to a statement from John Hogan, president and CEO of Clear Channel. "It was vulgar, offensive and insulting, not just to women and African-Americans but to anyone with a sense of common decency."

Stern, still on the air in most major markets, defended himself on his Thursday morning show.

"A caller used the 'N' word, and I hung up on him," the jock told his listeners.

Stern said he isn't really sure what's happening with Clear Channel, but he believes the company is under tremendous pressure because of the Janet Jackson breast-flashing incident at the Super Bowl.

"They are so afraid of me and what this show represents," Stern said.