- Environmental justice
- The principle that all people deserve equal protection from pollution and an equal voice in decisions about land, air and water where they live.
- Environmental racism
- Policies and practices that expose communities of color to more pollution and environmental hazards than white communities, whether or not anyone intended that result.
- Fenceline community
- A neighborhood located directly next to an industrial facility, such as a refinery or chemical plant. A 2017 NAACP and Clean Air Task Force report found African Americans are 75 percent more likely than the average American to live in one.
- Sacrifice zone
- An area where residents live with heavy pollution because governments and industry have allowed hazardous facilities to cluster there.
- Cumulative impacts
- The combined health effects of every pollution source in an area, as opposed to judging each new facility on its own.
- Disparate impact
- A legal standard that treats a policy as discriminatory when it harms one racial group more than others, even without proof of intent. The Justice Department removed it from its Title VI rules in December 2025.
- Title VI
- The section of the Civil Rights Act of 1964 that bans discrimination by race, color or national origin in programs that receive federal money, including state environmental agencies.
- Redlining
- The 1930s federal practice of marking Black and immigrant neighborhoods as risky for mortgage lending. Those neighborhoods received less investment, including fewer trees and parks.
- Urban heat island
- An area of a city that stays hotter than its surroundings because of pavement, buildings and a lack of trees.
- PM2.5
- Fine particles of air pollution 2.5 micrometers wide or smaller. They come from sources such as vehicles, power plants and factories, and they can enter the lungs and bloodstream.
- Justice40
- A 2021 federal goal to direct 40 percent of the benefits of certain climate and clean energy spending to disadvantaged communities. It was revoked in January 2025.
- EJScreen
- EPA's mapping tool that combined pollution and demographic data by neighborhood. EPA removed it in February 2025, and volunteer groups now host copies.