Which of these additional factors does not influence drift?

Drift refers to the movement of pesticides or other chemicals away from the target area, often influenced by environmental factors. The reentry interval is a specific timeframe established after pesticide application during which individuals are instructed to avoid entering the treated area to ensure safety. This interval is primarily concerned with the safety of workers and the public rather than the dispersion or drift of the chemicals themselves.

In the context of drift, humidity, height of release, and wind speed and direction are all crucial factors. Humidity can affect the particle size of droplets and their ability to settle; higher humidity often results in larger droplets that are less susceptible to drift. The height at which a pesticide is released can significantly impact how far it travels, as higher releases are more likely to be caught by winds. Wind speed and direction directly dictate the movement of airborne particles and droplets, contributing to where the pesticide may drift.

Thus, while reentry interval is an important safety guideline, it does not influence the drift of chemicals after application.