Mark one answer
Harmful compounds in the exhaust emissions
Damage to the engine caused by using dirty fuel
How long it takes for the engine to warm up
How much noise the engine produces
Explanation: Catalytic converters are exhaust-treatment systems that remove most of the harmful compounds from the exhaust gases. These include carbon monoxide, nitrogen oxides and hydrocarbons. The converter only deals with toxic, polluting gases; carbon dioxide is still produced.
Category: Band 2 traffic signs and signals
References: The Official DVSA Guide to Driving: Section 17
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