Discussion
Match each term in List I with its definition in List II.
List I
A. Aerodynamic diameter
B. Emission factor
C. Secondary pollutant
D. Global warming potential
List II
1. Emitted mass per unit of activity
2. Diameter of a unit density sphere with the same settling velocity
3. Climate effect relative to carbon dioxide over a stated period
4. Formed by reaction in the atmosphere
Select the correct match.
Answer: A
Correct answer: A-2, B-1, C-4, D-3
Each term takes its standard definition. Aerodynamic diameter (A) is the diameter of a unit-density sphere with the same settling velocity (2). An emission factor (B) is emitted mass per unit of activity (1).
A secondary pollutant (C) is one formed by reaction in the atmosphere (4), and global warming potential (D) is a substance's climate effect relative to carbon dioxide over a stated period (3) - the stated period being essential, since methane's value is about 28 over a hundred years but around 80 over twenty.
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