FIGURE 11.30 Range of surface concentrations of NO, NO^, and NO,, at a variety of Northern Hemisphere locations. The asterisk is the mean and the horizontal line the median. The bar represents the central 90% of measured values. SNP, Shenandoah National Park, Virginia; SLD, Schauinsland, Germany; EGB, Egbert, Ontario, Canada; and HAR, Harvard Forest, Massachusetts. (Adapted from Emmons et al., 1997.)
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