SAChE Atmospheric Dispersion (ELA967) Module 2 Practice Test

Which stability classes are considered unstable in this context?

A and B E and F C and D A and C

Correct Answer:

A and B

Explanation:

Stability classification for atmospheric dispersion uses a scale from very unstable to very stable. Unstable means strong vertical mixing and turbulence. The two classes at the unstable end are very unstable and moderately unstable, representing the strongest turbulent conditions. Therefore, the pair you’re looking for is the two most unstable classes. The other options mix in neutral or stable conditions (or include only the less strongly unstable class), which do not meet the criterion of being unstable in this context.

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