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Address correspondence to Å. Bergman, Department of Materials and Environmental Chemistry, Stockholm University, SE-10691 Stockholm, Sweden. E-mail: ake. bergman@ mmk. su. se United Nations Environment Programme (UNEP) address: 13 chemin des Anémones, CH-1219 Chatelaine, Geneva, Switzerland. aThe author is an employee of the National Institute of Environmental Health Sciences (NIEHS), National Institutes of Health (NIH); any statements, opinions, or conclusions contained herein do not necessarily represent the statements, opinions, or conclusions of the NIEHS, NIH, or the US government. bThe authors are staff members of the United Nations Environment Programme (ASB is now retired). The authors alone are responsible for the views expressed in this article, and they do not necessarily represent the decisions or policies of the United Nations Environment Programme. cThe authors are …