Figure 3. May dissolved nitrite plus nitrate to the Gulf of Mexico and area of mid-summer bottom water hypoxia (dissolved oxygen concentrations of less than 2 milligrams per liter) in the northern Gulf of Mexico. Data for 2018 are estimated using discrete water-quality samples and daily streamflow data. Hypoxia area data from Nancy N. Rabalais, Louisiana Universities Marine Consortium. *Hypoxia area data are not available for 1989 and 2016.
