FIGURE 2-11 Wet deposition of NH4+ and NO3 averaged for 1990-1996 data from the National Atmospheric Deposition Program in each of the 133 accounting units that make up the Mississippi River basin.

NOTE: Blue circles indicate where NADP and CASTNet (Clean Air Status and Trends Network) sites are co-located.

SOURCE: Goolsby et al. (1999).

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