Pollution
Water pollution

Nitrogen and phosphorus are two of the primary nutrient pollutants in the Bay's ecosystem. In order to better understand and thereby control these contaminants, the EPA's Chesapeake Bay Program monitors water quality and creates computer models based, in part, on those results. Recent modeling results and how this informs efforts to maintain and improve the health of the Bay are well presented by Karl Blankenship in the Bay Journal at:

http://www.bayjournal.com/01-01/nutrient.pdf.

Effect of Land Use Types on Water Quality | Imperviousness
Sources of Air Pollution in the Watershed | Water Pollution
Emission Calculator | Pollution Resources