Weird, Louisiana smells

Is it just me or does everyone else in the city often get smacked in the face with a whiff of stink?

I can't be the only one.

Some days it smells like sewage. Other days the smell is so rank I can't identify its origin. Some people contribute the smell to a meat processing plant on North Market Street. I've heard other people say they don't smell it at all. Shreveport doesn't smell constantly, nor do I smell that infamous stink more than twice per day. But, it does exist.

What is it? Someone please fill me in.