Hypoxic

Sixty-five percent of U.S. estuaries and coastal water bodies are moderately to severely degraded by excessive nutrient inputs, which lead to algal blooms and low-oxygen (hypoxic) waters that can kill fish and seagrass and reduce essential fish habitats.

NOAA forecasted in June that the hypoxic zone — an area with little to no oxygen to support marine life — would be 12,600 square kilometers, which would have been smaller than the five-year average. The actual size proved far larger.

Chronic obstructive pulmonary disease had left her hypoxic and wheezing.

Rarely, nitrox mixtures are intentionally hypoxic, under special conditions.

Dead zones are hypoxic areas in the world's oceans and large lakes.