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

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Mean concentration over time, 1973–1998: (A) PM_2.5; (B) PM₁₀; and (C) O₃. (A and B) Sexes combined: AHSMOG cohort (solid line), Ontario East air basin (dashed line), and San Diego air basin (dotted line). (C) AHSMOG cohort (solid line), mountain areas (dashed line), and coastal areas (dotted line). The y-axis scales differ among the three panels.