Which statement most accurately reflects the relationship between dew-point temperature and moisture in Earth's atmosphere?

A high dew-point temperature indicates moist air because the dew point is a measure of the temperature at which air must be cooled to become saturated with moisture. When the dew point is high, it means that the air contains a significant amount of water vapor, leading to higher humidity levels. This is because warm air has the capacity to hold more moisture, and when that air cools to the dew point, condensation occurs.

In contrast, lower dew-point temperatures correspond to lower moisture content in the air, indicating drier conditions. Thus, understanding dew point gives insight into humidity levels—high dew points are associated with a more humid environment, making the statement about high dew-point temperatures indicating moist air accurate.