Stockholm Convention

The Stockholm Convention on Persistent Organic Pollutants is a multilateral environmental agreement adopted on 22 May 2001 in Stockholm, Sweden, and entered into force on 17 May 2004 after the 50th ratification. It is administered by the United Nations Environment Programme (UNEP) through a Secretariat based in Geneva, co-located with the Basel and Rotterdam Convention secretariats under the "BRS" cluster.

The treaty targets persistent organic pollutants (POPs) — chemicals that resist degradation, bioaccumulate in food chains, travel long distances through air and water, and pose risks of serious health effects including cancer, birth defects, and immune and endocrine disruption. Original obligations covered the so-called "dirty dozen," including aldrin, chlordane, DDT, dieldrin, endrin, heptachlor, hexachlorobenzene, mirex, toxaphene, PCBs, dioxins, and furans. Subsequent Conferences of the Parties (COPs) have added further substances, including lindane, perfluorooctane sulfonate (PFOS), several brominated flame retardants, and perfluorooctanoic acid (PFOA).

Substances are listed under three annexes:

• Annex A — elimination of production and use
• Annex B — restriction (e.g., DDT remains permitted for disease vector control under WHO guidelines)
• Annex C — unintentional production, requiring measures to reduce releases

Parties must develop National Implementation Plans (NIPs), report on production and trade, manage stockpiles and wastes in environmentally sound ways, and identify contaminated sites. A POPs Review Committee (POPRC) evaluates scientific nominations for new listings before they go to the COP for decision, typically by consensus or, failing that, a three-fourths majority.

The Convention is closely linked to the Basel Convention (hazardous waste) and Rotterdam Convention (prior informed consent for chemicals trade). Financial assistance flows primarily through the Global Environment Facility (GEF). Notably, the United States has signed but not ratified the treaty.