Contamination and pollution Introduction of harmful substances
into the environment by human action or natural processes.
Northern Gulf of Mexico ecosystem change and hazard
susceptibility [ More info] Map interfaces and data in the area
offshore Louisiana, Mississippi, and Alabama which was affected
most by hurricane Katrina and, more recently, the oil spill.
Nutrients National Synthesis Project: nutrients in rivers,
streams, and aquifers in the United States [ More info] This
Nutrients National Synthesis Project site on the U.S. study of
nutrients, especially nitrogen and phosphorus, as contaminants
in high concentrations links to an overview, study team,
featured reports, publications, and national datasets. Nutrients
in the Nation's streams and groundwater: National findings and
implications [ More info] Despite public sector efforts to
reduce nonpoint-source nutrients in streams and rivers,
concentrations have remained the same or increased, continuing
to pose risks to aquatic life and human health. Occu