The largest concentration of condensation nuclei are usually observed near the earth's surface.

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Quizplus · Accepted Answer

This is true. The largest concentration of condensation nuclei are usually found near the surface of the Earth where human and natural activities produce particles such as dust, dirt, pollen, and smoke. These nuclei provide surfaces for water vapor to condense onto and form clouds. As you go higher in the atmosphere, the concentration of condensation nuclei decreases.

The Largest Concentration of Condensation Nuclei Are Usually Observed near the Earth's