FIGURE 11.27 Ratio of the sum of (NO + N02 + PAN + HN03 + particulate nitrate) measured individually to total measured NO,, at three sites in the United States (Whitetop Mountain, Tennessee; Bondville, Illinois; and Scotia, Pennsylvania) and one in Canada (Egbert, Ontario). The bars represent the range of results and the mid-range lines the median values (adapted from Parrish et al, 1993).

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