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There are several main types of pollution and well-known effects of pollution which are commonly discussed. These include smog, acid rain, the greenhouse effect, and "holes" in the ozone layer.
2. volcanic eruptions,
3.wind erosion, pollen dispersal,
4.evaporation of organic compounds, and natural radioactivity are all among the natural causes of air pollution.
The biggest causes are the operation of fossil fuel-burning power plants and automobiles that combust fuel. Combined, these two sources are responsible for about 90% of all air pollution in the United States.
Each of these problems has serious implications for our health and well-being as well as for the whole environment. In the United States, we spend about 80-90% of our time inside buildings, and so our exposure to harmful indoor pollutants can be serious