Persistent Organic Pollutants (POPs) are a class of organic compounds that do not break down easily in nature and are widely found in agricultural pesticides, industrial chemicals, and byproducts of manufacturing processes. Once released, these substances do not easily disappear. They are bioaccumulative, meaning they accumulate in the fatty tissues of living organisms and spread as these organisms migrate. They can even travel long distances through the air and water, leading to the presence of POPs in regions where they have never been produced or used, making them a global environmental challenge that transcends national borders.
Humans may be exposed to POPs through contaminated food, drinking water, air, or occupational exposure, which may have the following effects on human health:
- Effects on the immune and nervous systems
- Damage to reproductive and developmental functions
- Disruption of the endocrine system
- Some substances pose a carcinogenic risk
To mitigate these risks, the international community adopted the Stockholm Convention, which requires countries to establish regulations to phase out and restrict the production, use, and release of specific POPs. Common examples of POPs include dioxins and furans, polychlorinated biphenyls (PCBs), certain pesticides (such as DDT), brominated flame retardants, and per- and polyfluoroalkyl substances (PFAS, such as PFOS, PFOA, and PFHxS), among others.