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There are a number of different kinds of air pollution, which have a variety of effects. Greenhouse gases, primarily carbon dioxide but also methane and others, contribute to global warming. Chlorofluorocarbons destroy the ozone layer. Nitrogen oxides and sulfur oxides contribute to acid rain. Complex hydrocarbon emissions from cars lead to photochemical smog. Ozone, which is useful at high altitudes as a screen for ultraviolet radiation, is toxic at lower levels where people can breathe it. There are other types of air pollution as well. The human race has been producing a wide variety of chemicals, many of which wind up in the air.

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