Dichloro-diphenyl-trichloroethane (DDT) is a

DDT (Dichloro-diphenyl-trichloroethane) is a synthetic organochlorine insecticide. It is classified as a non-biodegradable pollutant because it cannot be broken down or decomposed into harmless substances by natural biological processes or microorganisms.

• Persistence: DDT is highly stable and remains in the environment (soil and water) for decades.
• Bioaccumulation and Biomagnification: Due to its fat solubility, it accumulates in the fatty tissues of living organisms. Its concentration increases at each successive trophic level of the food chain, a process known as biomagnification, which led to its ban in many countries for agricultural use.

In contrast, biodegradable pollutants (like domestic sewage or paper) are those that can be decomposed by the action of bacteria and fungi over a relatively short period.