It is well-documented that certain pollutants are associated with specific land use types. These types of pollutants cause problems in biological systems in a number of ways.
Blue areas indicate land uses for which there was insufficient data to conduct the analysis.
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.