Which of These Is LEAST Important in Determining the Level

question 90

Multiple Choice

Which of these is LEAST important in determining the level of air pollution from a particular source?

• A)stability of the air layer
• B)relative humidity at ground level
• C)height of stack used
• D)amount of turbulent mixing
• E)prevailing wind speed and direction

---

Definitions:

Threshold Level

The point at which a relatively small change or variation in external conditions can cause a rapid change in an ecosystem or in the properties of a substance.

Technological System

An organized arrangement of people, machines, and procedures designed to perform and control various functions and processes for achieving specific objectives.

Economic Analysis

A study that evaluates the cost-effectiveness of interventions in the economy.

Blood Transfusions

A medical procedure involving the transfer of blood from a donor to a recipient to replace lost components of the blood.