Pollutant
A pollutant was a substance or energy which contributed to pollution.

In 2368, the homes of Corvan gilvo in the rainforests of the planet Corvan II were threatened by industrial pollutants. ()

In 2369, when Doctor Julian Bashir arrived at a Bajoran village he received a medical emergency call from, he scanned the air, the ground water, and the soil but was not able to find any pollutants. ()

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Materials
Poisonous substances
Radiation