A stretch of the Mississippi River from New Orleans to Baton Rouge, La., that is crowded with chemical plants has been called "Cancer Alley" because of the health problems there.
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Robert Taylor, center, speaks at a St. John the Baptist Parish council meeting in 2017. He and the other members of the citizens' group around him wear T-shirts that reference the safety limit for the chemical chloroprene.
The Highlands Acid Pit Superfund site remained flooded on August 31. The water has since receded, and some residents are concerned that toxins from the site could have spread into the nearby neighborhood.
A U.S. Air Force C-123 sprays herbicides on dense jungle beside a South Vietnamese highway on May 18, 1966. This aircraft is the last in a formation of three. Spray from the other two planes can be seen ahead.
U.S. Air Force via AP