
NOAA says Gulf of Mexico dead zone is smaller this year
1 of 2 | This is a map of measured Gulf hypoxia zone, July 20 - 25. The red area denotes 2 mg/L of oxygen or lower, the level considered hypoxic, at the bottom of the seafloor. Image courtesy of NOAA/LUMCON/LSU July 31 (UPI) -- The Gulf of …