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Why do MOT tests include a strict exhaust emission test?*

A To help protect the environment against pollution
Explaination
Emission tests are carried out to ensure your vehicle's engine is operating efficiently. This ensures the pollution produced by the engine is kept to a minimum. If your vehicle is not serviced regularly, it may fail the annual MOT test.
B To recover the cost of expensive garage equipment
C To discover which fuel supplier is used the most
D To make sure diesel and petrol engines emit the same fumes