Which environmental factor is NOT typically associated with increasing vapor drift?

Vapor drift, also known as spray drift, refers to the movement of pesticide vapors away from the target application area, which can result in unintended exposure to non-target organisms. Certain environmental factors influence this phenomenon significantly.

High temperatures can increase the volatility of certain pesticides, meaning they can evaporate and drift more easily in warmer conditions. Low relative humidity also contributes to increased vapor drift because dry air can promote the rapid evaporation of pesticides. High atmospheric pressure can affect air movement and increase pesticide drift as well.

In contrast, high soil moisture does not typically contribute to increasing vapor drift. When soil moisture levels are high, it often corresponds to cooler, more humid conditions. This environment can reduce pesticide volatility and evaporation, thus reducing the chances of vapor drift. Therefore, the environmental factor that is not typically associated with increasing vapor drift is high soil moisture.