Discussion
Statement I: An emission inventory can be built without measuring every source.
Statement II: Emission factors relate emitted mass to an activity level that is already recorded.
In the light of the above statements, choose the correct answer.
Answer: B
Correct answer: Both Statement I and Statement II are correct
Both statements are correct and the second explains the first. An emission factor relates the mass emitted to a unit of activity - grams per vehicle kilometre, kilograms per tonne of fuel, kilograms per head of livestock - and those activity data are already collected for quite other purposes.
So an inventory is built by multiplying recorded activity by tabulated factors, which is the only tractable approach when a city contains hundreds of thousands of emitters. Measurement is reserved for major point sources and for validating the factors themselves.
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