👉 The "Mississippi Fumes" refer to a persistent, unpleasant odor often associated with industrial areas along the Mississippi River, particularly in cities like St. Louis, Missouri, and New Orleans, Louisiana. This smell is primarily caused by the release of volatile organic compounds (VOCs) from oil refineries, chemical plants, and other industrial facilities that line the riverbanks and surrounding regions. These compounds can evaporate into the air, creating a lingering, acrid scent that can be both irritating and disorienting to those exposed. The nickname "Mississippi Fumes" reflects the widespread nature of this issue, as the river itself has become a conduit for these pollutants, affecting not just local communities but also travelers and residents downstream.