A pollutant / adulterant is a substance or particles introduced in the environment due to human action (chemicals, pesticides) or natural (CO2) that causes undesired effect to. This unwanted particle can cause short-term (or) long-term damage to plants, animals and humans. Pollutants may be biodegradable but the end products of few degrading pollutant are also harmful for the environment as they contaminate air, water, and soil.
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