HAPs are a broad category of pollutants that include arsenic, mercury, and Persistent Organic Pollutants (POPs) such as PCBs and DDT. Some of the health risks associated with HAPs are cancer and growth retardation. Some research has suggested that POPs can be transferred through breast milk and interfere with development or reproduction. Scientific research suggests that POPs may mimic human hormones, interfering with reproduction and other developmental processes.

PCBs are notorious for travelling large distances over the earth, moving from warmer climates, such as Brazil, to cooler climates, such as the Canadian Artic.

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