Oct 1, 2024 · For the purposes of regulation, the United States Environmental Protection Agency identifies two broad categories of pollution: point-source pollution and nonpoint-source pollution.

Jul 30, 2025 · Pollution is the introduction of harmful materials into the environment. These harmful materials are called pollutants.

Oct 19, 2023 · Runoff is a major source of water pollution. As the water runs along a surface, it picks up litter, petroleum, chemicals, fertilizers, and other toxic substances.

Oct 19, 2023 · The pollutants in the harbor accumulate in its oysters, a filter feeder. In the 1940s and 1950s, a pesticide called DDT (dichloro-diphenyl-trichloroethane) was widely used to kill insects that …

Explorer Shannon Switzer treks one of San Diego’s longest rivers, starting in the mountains and ending in the ocean, and documents the pollutants affecting its health.

Jun 5, 2025 · Air pollution consists of chemicals or particles in the air that can harm the health of humans, animals and plants. It can even damage buildings.

Oct 1, 2024 · Shanghai's smog is a mixture of pollution from coal, the primary source of energy for most homes and businesses in the region, as well as emissions from vehicles.

Oct 19, 2023 · The excess levels of nitrogen and phosphorus have caused the once-beneficial nutrients to become pollutants. Roughly half the nitrogen in synthetic fertilizers escapes from the fields where …

Apr 15, 2024 · Have students identify examples of pollution. Tell students that people use water for agriculture, industry, manufacturing, power, transportation, and recreation.

Oct 19, 2023 · Plastic pollution has become one of the most pressing environmental issues, as rapidly increasing production of disposable plastic products overwhelms the world’s ability to deal with them.