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  2. Pollution - Wikipedia

    Air pollution: the release of chemicals and particulates into the atmosphere. Common gaseous pollutants include carbon monoxide, sulfur dioxide, chlorofluorocarbons (CFCs) and nitrogen oxides produced by industry and motor vehicles. Photochemical ozone and smog are created as nitrogen oxides and hydrocarbons react to sunlight.

  3. Pollutant - Wikipedia

    A pollutant or novel entity [1] is a substance or energy introduced into the environment that has undesired effects, or adversely affects the usefulness of a resource. These can be both naturally forming (i.e. minerals or extracted compounds like oil) or anthropogenic in origin (i.e. manufactured materials or byproducts from biodegradation).

  4. Air pollution - Wikipedia

    Air pollution is the contamination of air due to the presence of substances in the atmosphere that are harmful to the health of humans and other living beings, or cause damage to the climate or to materials. [1]

  5. Regulation and monitoring of pollution - Wikipedia

    Regulation and monitoring of pollution To protect the environment from the adverse effects of pollution, many nations worldwide have enacted legislation to regulate various types of pollution as well as to mitigate the adverse effects of pollution . Contents 1 Regulation and monitoring by region 1.1 International 1.1.1 Greenhouse gas emissions

  6. Water pollution - Wikipedia

    Water pollution (or aquatic pollution) is the contamination of water bodies, usually as a result of human activities, so that it negatively affects its uses. [1] : 6 Water bodies include lakes, rivers, oceans, aquifers, reservoirs and groundwater. Water pollution results when contaminants are introduced into these water bodies.

  7. Nonpoint source pollution - Wikipedia

    Nonpoint source ( NPS) pollution refers to diffuse contamination (or pollution) of water or air that does not originate from a single discrete source. This type of pollution is often the cumulative effect of small amounts of contaminants gathered from a large area. It is in contrast to point source pollution which results from a single source.

  8. Environmental issues - Wikipedia

    It is defined as any change or disturbance to the environment perceived to be deleterious or undesirable. [11] Environmental concerns can be defined as the negative effects of any human activity on the environment. The biological as well as the physical features of the environment are included.