Once released to the environment, contaminants move through and across different media and some degrade altogether describes what?

• A. Emission
• B. Contamination
• C. Source
• D. Environmental Fate and Transport

Answer: (D)

Contaminant behavior after release is the focus here. Once released, pollutants don’t stay put; they move through air, water, soil, and sediments and can spread to new areas. Transport happens through processes like advection and diffusion, with interactions such as sorption affecting how mobile they are. At the same time, degradation processes—biological, chemical, or photolytic—can transform or mineralize contaminants, reducing their concentration. The combination of movement across media and potential degradation is what Environmental Fate and Transport describes. The other terms refer only to the release (emission), the presence (contamination), or the origin (source) and don’t capture both movement and transformation across media.