Answer: Hydrocarbon
Notes: The gaseous air pollutants of primary concern in urban settings include oxides of carbon, sulphur and nitrogen such as sulfur dioxide, nitrogen dioxide, and carbon monoxide; these are emitted directly into the air from the combustion of fossil fuels.Smoke, a collection of airborne solid and liquid particulates and gases emitted when a material undergoes combustion, is also a pollutant. Hydrocarbon is an organic compound consisting entirely of hydrogen and carbon. On combustion, it produces carbon dioxide and water only.
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