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  2. Pollution - Wikipedia

    en.wikipedia.org/wiki/Pollution

    Pollution is the introduction of contaminants into the natural environment that cause harm. [1] Pollution can take the form of any substance (solid, liquid, or gas) or energy (such as radioactivity, heat, sound, or light). Pollutants, the components of pollution, can be either foreign substances/energies or naturally occurring contaminants.

  3. Air pollution in the United States - Wikipedia

    en.wikipedia.org/wiki/Air_pollution_in_the...

    The main sources of environmental pollution are the burning of fossil fuels in the combustion engines, dust generated by traffic on road surfaces, and biomass used for cooking and heating. In urban areas, there are high concentrations of particulate matter, nitrogen dioxide, ozone, and other volatile organic compounds and can make breathing ...

  4. Pollution in the United States - Wikipedia

    en.wikipedia.org/wiki/Pollution_in_the_United_States

    Air pollution is caused predominantly by burning fossil fuels, cars, and much more. [4] Natural sources of air pollution include forest fires, volcanic eruptions, wind erosion, pollen dispersal, evaporation of organic compounds, and natural radioactivity. These natural sources of pollution often soon disperse and thin settling near their locale.

  5. 25 Most Polluted Cities in the World

    www.aol.com/news/25-most-polluted-cities-world...

    The oldest city in the Jind district, the city is home to around 170,000 people and the high usage of traditional vehicles is one of the main sources of pollution. 16. Lucknow, India

  6. Air pollution - Wikipedia

    en.wikipedia.org/wiki/Air_pollution

    burning of traditional biomass such as wood, crop waste and dung. (In developing and poor countries, [22] traditional biomass burning is the major source of air pollutants. [23] [24] It is also the main source of particulate pollution in many developed areas including the UK & New South Wales. [25] [26]

  7. Water pollution - Wikipedia

    en.wikipedia.org/wiki/Water_pollution

    Agriculture is a major contributor to water pollution from nonpoint sources. The use of fertilizers as well as surface runoff from farm fields, pastures and feedlots leads to nutrient pollution. [63] In addition to plant-focused agriculture, fish-farming is also a source of pollution.

  8. Water pollution in the United States - Wikipedia

    en.wikipedia.org/wiki/Water_pollution_in_the...

    Nonpoint source pollution occurs when the contamination derives from multiple different sources. This type of pollution is very challenging to manage given that the original source(s) may be difficult to identify. [15] Nonpoint source pollution is the most common type of pollution because as rainfall runs off of land on its path to different ...

  9. List of most-polluted rivers - Wikipedia

    en.wikipedia.org/wiki/List_of_most-polluted_rivers

    Name Location Dependent population Description Sources of pollution Impact Bharalu River: Assam, India: One of the most polluted rivers in the state of Assam. [19] The biochemical oxygen demand of the river is 52 mg/L in compared to the permissible limit set by the National River Conservation Directorate (NRCD) at 3 mg/L. [20]