Learn the Issues

Indicators: Zooplankton

Zooplankton are small, free-floating aquatic microorganisms including crustaceans, rotifers, open water insect larvae, and aquatic mites. The zooplankton community is composed of both primary consumers and secondary consumers.

Indicators: Sediment Diatoms

Diatoms are a type of algae that are typically abundant in marine and freshwater ecosystems. They have inorganic cell walls made up of silica (glass). Diatoms most commonly grow suspended in water, although they can also attach to substrates.

Indicators: Phytoplankton

Phytoplankton are free-floating, microscopic algae that inhabit the sunlit, upper layer of most freshwater and marine environments. They are usually responsible for the color and clarity of lakes, wetlands, rivers, streams and estuaries.

Indicators: Fish Assemblage

Fish assemblage refers to the variety and abundance of fish species in a given waterbody. Fish are sensitive indicators of physical and chemical habitat degradation, environmental contamination, migration barriers, and overall ecosystem productivity.

Great Lakes Fish Monitoring and Surveillance

Explains what the Great Lakes Fish Monitoring and Surveillance Program is.

Indicators: Wetland Vegetation (Plant Community)

Wetland vegetation specifically grows in water or is adapted to a growing in soil that is at least periodically flooded with water. These wetland plants are also referred to as “hydrophytes.”

Webinar: SmartWay Profiles in Leadership Inaugural Webinar

This EPA presentation provides information on the SmartWay Profiles in Leadership Inaugural Webinar.

Salt

2023 Safer Choice Partner of the Year Awards Ceremony and Partner and Stakeholder Summit

Event and registration information for EPA's Safer Choice Partner of the Year Awards Ceremony and Partner Stakeholder Summit 2022

First Integrated Urban Air Toxics Report to Congress

Information about the first Integrated Urban Air Toxics Report to Congress released in July 2000

Indicators: Chlorophyll a

Chlorophyll allows plants (including algae) to photosynthesize, i.e., use sunlight to convert simple molecules into organic compounds. Chlorophyll a is the predominant type of chlorophyll found in green plants and algae.

Indicators: Benthic Macroinvertebrates

Benthic (meaning “bottom-dwelling”) macroinvertebrates are small aquatic animals and the aquatic larval stages of insects. Benthic macroinvertebrates are commonly used as indicators of the biological condition of waterbodies.

Webinar - New Mobility Mindsets: On-Demand Transit

Recording, slides, and Q & A from a November 2020 webinar about on-demand transit policies and programs in general, and in Dallas and Ohio in particular.

SEMS Search User Guide

Superfund is a program administered by the EPA to locate, investigate, and clean up the worst hazardous waste sites throughout the United States.

Sulfur Dioxide Basics

Sulfur dioxide (SO2) is one of a group of highly reactive gasses known as “oxides of sulfur," and are emitted into the air as result of fossil fuel combustion and other industrial processes.

EPA Order 3120.5 POLICY AND PROCEDURES FOR ADDRESSING RESEARCH MISCONDUCT

EPA Order on misconduct

EPA Order 1000.17 on Policy and Procedures of Protection of Human Research Subjects in EPA Conducted or Supported Research

This Order supersedes EPA Order 1000.17 Policy and Procedures on Protection of Human Subjects, July 30, 1999 including changes thereto, and establishes EPA responsibilities and policies for the use of human subjects in research.