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. 2005 Aug 2;113(12):1723–1729. doi: 10.1289/ehp.8190

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Frequency distribution of mean ambient concentration of (A) PM₁₀, (B) PM_2.5 , and (C) PM_10–2.5, 1973 to censoring month; n = 3,239. Note that the x-axis scales differ among the three panels.