My car makes a humming noise while I am driving?

I drive an 06 dodge stratus. when I am driving at 30 mph or higher the car makes a real loud humming noise from the passenger side rear also makes the noise while I am decelerating what could it be?

Other answer:

Aaron:
Rear wheel bearings
mustanger:
My crystal ball froze over so your best bet is to get a mechanic diagnose it before something bad happens like a wheel seizing up.
Aaron:
the bands on the tire where broke really bad fixed the tire and no humming noise thank yall tho
hotstuffktr:
Bad wheel bearing.
J J:
Maybe a inner fender part came loose and is flapping in the breeze.
PMack:
My guess is a wheel bearing. You'd better get that fixed.
Hellokitty:
No