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Which unit does a type approval limit use?

  • A.A mass of pollutant emitted for each kilometre travelled, measured over the whole of a prescribed driving cycle
  • B.Grams per kilometre
  • C.Per cent by volume, which is the unit used at a periodic inspection and is therefore directly comparable
  • D.Parts per million

Answer: B

Approval limits are a mass per distance measured over a cycle. The last option explains exactly that, which makes it a correct and more detailed version. Concentration units belong to the periodic test. Naming the cost of a choice alongside its benefit is what turns a fact into a design decision. Working the distinction through on a single concrete case fixes it more firmly than any rule of thumb. The shared behaviour explains why these belong together and the differences explain why both exist.

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