Which of these additional factors does not influence drift?

Drift is inherently influenced by a variety of environmental conditions and physical parameters related to the application of pesticides or other substances. Among the options provided, the reentry interval refers to the minimum amount of time that must pass after an application before individuals can safely re-enter the treated area. This factor is primarily related to safety and toxicity rather than the physical dynamics of how the pesticide moves through the air after spraying.

The other factors listed – humidity, height of release, and wind speed and direction – all impact how far and in what manner a pesticide may drift once it is applied. For example, humidity can affect droplet evaporation, which in turn can influence drift distance. The height from which the substance is released can affect exposure to wind, further dictating how far the material travels. Wind speed and direction are critical in determining the trajectory and distance traveled by drift. Thus, while the reentry interval is an important consideration for safety and operational guidelines, it does not affect the drift itself.