Definition
When something is "polluted," it means it's been made dirty or harmful, usually by adding unwanted or dangerous substances. Think of air filled with smoke or a river full of trash; those are polluted environments. It suggests that something was once clean or usable, but is now compromised. This term is often used when discussing the environment, water, or air quality. It emphasizes the presence of harmful contaminants that make something unsafe or undesirable.