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. 2015 Feb 24;123(6):525–533. doi: 10.1289/ehp.1408095

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Estimated annual mean PM_2.5 elemental composition concentrations (ng/μg³) at participant addresses in each cohort. The solid circle and bars shows the median and 25th and 75th percentiles of elemental composition concentrations; the x shows the 5th and 95th percentile values.