Which term describes pollution that comes from a single clear location, such as a factory pipe?

• A. Ambient pollution
• B. Diffuse pollution
• C. Point source pollution
• D. Nonpoint source pollution

Answer: (C)

Pollution from a single, identifiable origin is point source pollution. When contaminants are discharged from one clear outlet—like a factory pipe—the source can be located and regulated directly, which is the defining feature of a point source. In contrast, nonpoint (or diffuse) pollution comes from many scattered sources across a landscape, such as runoff from roads and fields, making it hard to pin to one site. Ambient pollution refers to the general level of pollutants in the environment rather than to a specific source. So the term that fits a single clear location is point source pollution.