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Which source did the earliest emissions legislation address?

  • A.The gases escaping past the piston rings into the crankcase, which were formerly vented directly to the atmosphere
  • B.Crankcase blow-by gases
  • C.Exhaust emissions, which were the first to be regulated because they constitute the largest source of pollution
  • D.Evaporative emissions

Answer: B

Crankcase ventilation was the first control fitted, in the early nineteen sixties. The last option describes exactly that source, which makes it a correct and more detailed version. Exhaust controls followed shortly afterwards. Naming what changes and what stays the same is the reliable route through questions of this shape. Checking which component actually carries the load settles most questions of this kind at once. Framing the question as which quantity the change acts upon makes the answer follow without calculation.

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