The 12 toxic chemicals banned by the Stockholm Convention on Persistent Organic Pollutants are: Aldrin. The Convention entered into force on 17 May 2004, ninety (90) days after submission of the fi ftieth instrument of ratifi cation, acceptance, approval or … Secretary Powell and Administrator Whitman and I are pleased to make an announcement on the Stockholm Convention on Persistent Organic Pollutants. The 12 POPs initially targeted, referred to as the ‘dirty dozen,’ are: aldrin, chlordane, DDT, dieldrin, endrin, heptachlor, hexachlorobenzene, mirex, toxaphene, PCB, polychlorinated dibenzo-p-dioxins, and polychlorinated dibenzofurans. Under the Stockholm Convention on Persistent Organic Pollutants, DDT is listed as one of the "Dirty Dozen." A pesticide used … The Stockholm Convention is a global treaty ratified by the international community and led by the United Nations Environment Programme (UNEP) that calls for the elimination and/or phasing out of 12 POPs, called the "dirty dozen" . This was closely followed in 2001, by the adoption of the Stockholm Convention which identified the initial 12 POPs (dirty dozen). Nicknamed the Dirty Dozen, the 12 POPs originally identified by the Stockholm Convention include pesticides, insecticides, refrigerants, and other toxic chemicals. The United Nations Economic Commission for Europe’s (UNECE) Protocol on Persistent Organic Pollutants (commonly known as the Aarhus Protocol) was adopted in 1998. This international agreement would restrict the use of 12 dangerous chemicals -- POPs, as they are known, or the Dirty Dozen. At its fourth meeting in May 2009, nine additional POPs were added to the Stockholm Convention. The Stockholm Convention originally identified 12 POPs (i.e., “the Dirty Dozen”) for elimination globally, and 185 countries have ratified this agreement. Adopted in 2001 by 91 countries including the Philippines and having entered into force in 2004, the Stockholm Convention enjoins states to take measures to eliminate or reduce the release of persistent organic pollutants (POPs) into the environment in order to protect human health and the environment. Persistent organic pollutants (POPs) are environmental chemicals that persist in the environment for long periods of time. Yet the use of DDT is allowed under the Convention under certain circumstances. INTRODUCTION. The UN, under the Stockholm Convention, has regulated many of these POPs. Recently, another 9 classes of POPs (i.e., “the Nasty Nine”) were identified for elimination. 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