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. 2009 Dec 21;8:58. doi: 10.1186/1476-069X-8-58

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Copyright ©2009 Zanobetti et al; licensee BioMed Central Ltd.

This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Community and season-specific proportions of species to PM_2.5mass for 6 selected species: Arsenic, Bromine, Chromium, Organic Carbon, Sodium, and Nickel. The seasons are: "black triangle" = winter; "black square" = spring; "star" = summer; "black circle" = autumn.