Hypoxic:Hypoxic refers to an environment with low levels of dissolved oxygen, which can be represented by the declining portion of the oxygen sag curve.
Dissolved Oxygen: Dissolved oxygen refers to the amount of gaseous oxygen (O2) present in water. It is essential for aquatic organisms' survival and indicates water quality.
Pollution Source: A pollution source refers to any point or non-point location where pollutants are released into the environment. Examples include industrial discharges, sewage treatment plants, and agricultural runoff.