Originally Posted by musigenesis
I've never heard of a "pollution belt" but perhaps there is such a thing.
Maybe runs the pump that lubes the muffler bearings with break fluid.
At first I thought "smog pump": the one that pumps air into the exhaust system to finish burning the unburnt fuel. But then I saw the year of the vehicle. I think they had moved on to better tech by then. Maybe I'm wrong.
EDIT: if it is the latter, it is likely a felony to disable it.