Green areas indicate land uses that are not sources for nitrogen pollution. This includes undeveloped and natural areas. The red to deep red land uses offer the greatest risk of high nitrogen concentrations in runoff from the area. The map at left shows wetlands and the relative risk to each for receiving nitrogen pollution. This analysis is based upon the method and results described above.
Blue areas indicate land uses for which there are insufficient data to analyze.
Green areas indicate wetlands that have no risk of pollution from surrounding land uses. These are wetlands that are surrounded by natural areas, preserves, or vacant land. The scale of nitrogen pollution risk corresponds to a gradient of color from white to deep red. Wetlands that are white to light red in color have lower risks for receiving nitrogen pollutants. Wetlands that are red to deep red have the highest risk.