Nearly half a million Americans have been warned to stay indoors and keep their windows shut as levels of airborne toxins have skyrocketed near the Gulf Coast.
Air quality monitoring stations in the South have detected a 150-mile-wide plume of polluted air hovering over parts of Louisiana, Texas and Arkansas Thursday morning.
The worst of the air pollution has been centered over Shreveport in northern Louisiana, home to more than 380,000 people in its greater metropolitan area alone…