Sure you can use your AKG for PA, if you want to. But if the fire department has a podium PA, don't they have a mic for it? Any old dynamic mic would be fine, and you would not have to risk using your AKG.
If you're going to use your AKG, you'll have to supply phantom power because I doubt the podium PA has got it. And put a big windscreen on your mic to keep the spit off of it.
Either the card cap or hyper cap should work fine.