Mercury, PCBs, and dioxin are chemicals that do not degrade under standard environmental conditions, and in the past they have accumulated to dangerous levels in the Great Lakes. These would be classified as

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Mercury, PCBs, and dioxin are examples of persistent organic pollutants (POPs), which are chemical substances that persist in the environment, bioaccumulate through the food web, and pose a risk to human health and the environment. These substances do not easily break down and can remain in the environment for long periods.

Mercury, PCBs, and Dioxin Are Chemicals That Do Not Degrade