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Hydrocarbon is an organic chemical compound of hydrogen and carbon in gas, liquid, or solid phase. Hydrocarbons can vary from simple methane too massive, complex compounds. Fossil fuels are made up of hydrocarbons. In-vehicle emissions, these are usually vapours created from incomplete combustion or from vaporization of liquid gasoline. Another source of hydrocarbon pollution is fuel evaporation, which occurs when gasoline vapours are forced out of the fuel tank (as during refuelling) or when gasoline spills and evaporates. Emissions of hydrocarbons contribute to ground-level ozone.

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