Discussion
Arrange the steps of compiling an emission inventory in order:
1. Classify sources as point, line or area
2. Collect activity data for each source category
3. Aggregate to totals by pollutant and by area
4. Apply emission factors to the activity data
Select the correct sequence.
Answer: D
Correct answer: 1, 2, 4, 3
The order follows the method. Sources are first classified as point, line or area (1), because the classification determines what activity data are needed and how each will be modelled. Activity data are then collected for each category (2) - fuel consumed, vehicle kilometres, livestock numbers.
Emission factors are applied to those data (4) to convert activity into emitted mass, and the results are finally aggregated to totals by pollutant and by area (3). The aggregation must come last, since it is the sum of everything computed before it.
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