Which describes a substance in the environment that detracts from natural quality, upsets the senses, or causes a health hazard?

• A. Contamination
• B. Contaminant
• C. Debris
• D. Pollution

Answer: (D)

Pollution describes the harmful condition that arises when unwanted substances enter air, water, or soil and degrade natural quality, irritate the senses, or pose health risks. It captures the overall effect on the environment and people, not just the presence of a substance. A contaminant is the actual substance causing trouble, contamination is the state of being contaminated, and debris is physical waste. So the best fit for describing the adverse environmental condition caused by such substances is pollution.