One rumor I heard was that more water was allowed to enter the Mississippi and thus the gulf after the oil spill in an attempt to keep oil off the coast. I don't know if that is even possible but if it is, could still be going on. More water from the big river means more pollution.
If that is a whacked scenario then it could simply be more chit flowing downstream from local rivers with all the recent rains.
Today, the situation is just as bad. In fact, the odor of raw sewage coming from the Gulf Trace out flow is worse today.