National Water-Quality Assessment Program

Nonpoint and Point Sources of Nitrogen In Major Watersheds of the United States

Figure 3.--Sources of nitrogen oxide emissions in the United States in 1988. Source: Kohout, E.J., D.J. Miller, L.Nieves, D.S. Rothman, C.L. Saricks, and F. Stodolsky, 1990. Month and state current emission trends for NO_x, SO_x, and VOC: methodology and results. Argonne National Laboratory, Argonne, IL.

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