A catalytic converter is a device that uses a catalyst to convert three harmful compounds in car exhaust into harmless compounds.
Converting three harmful compounds:
• Hydrocarbons (in the form of unburned gasoline)
• Carbon monoxide (formed by the combustion of gasoline)
• Nitrogen oxides (created when the heat in the engine forces nitrogen in the air to combine with oxygen)
Carbon monoxide is a poison for any air-breathing animal. Nitrogen oxides lead to smog and acid rain, and hydrocarbons produce smog.