Since no one is answering this, I'll give it a shot, but don't kill me if I'm wrong. 
Broadcast standard reference level for audio is +8 VU.
You can limit the piss out of it, as most stations do, to prevent overmodulation into another band. In fact, you HAVE to, according to the FCC.
Sometimes, with the hard limiting, EQ can make the sound of some material, typically commercials, sound a LOT louder than the regular program content.
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Bob.
