What happens to moisture levels in the air when its temperature drops?

When the temperature of the air drops, the capacity of air to hold moisture also decreases. Warm air can hold more water vapor than cold air, which is why cooler temperatures often result in a higher relative humidity. As the temperature declines, the air reaches a point where it can't retain as much moisture, leading to a decrease in the actual amount of water vapor present. This process can result in condensation if the temperature continues to drop, as the air becomes saturated and the moisture begins to condense into liquid form, such as dew or frost. This understanding is crucial for respiratory medical officers, as changes in humidity can affect respiratory conditions and overall air quality.