Discussion
Match each source in List I with its inventory classification in List II.
List I
A. Power station stack
B. Arterial road
C. Residential district
D. Leaking refinery flanges
List II
1. Line source
2. Point source
3. Fugitive emission
4. Area source
Select the correct match.
Answer: D
Correct answer: A-2, B-1, C-4, D-3
Each source takes its inventory classification. A power station stack (A) is a point source (2), a single identified location with known height and gas conditions. An arterial road (B) is a line source (1).
A residential district (C) is an area source (4), described by an emission density because its thousands of individual emitters cannot be enumerated. Leaking refinery flanges (D) are fugitive emissions (3) - escaping other than through a stack, and therefore estimated from leak surveys rather than measured.
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