What is the actual release or discharge of the material from a source?

• A. Emission
• B. Source
• C. Contamination
• D. Pollution

Answer: (A)

Emission is the act of releasing material from a source into the environment. It describes the actual release event, such as pollutants exiting a stack or pipe. Contamination refers to the presence of harmful substances in a material or environment, not the release itself. Pollution is the broader condition or impact resulting from pollutants in the environment. A source is simply where the material originates, not the act of releasing it. While discharge can be used for liquids, emission is the term that best captures the idea of the material being released from the source.