Which of the following factors has NO effect on off-target pesticide drift?

The factor that has no effect on off-target pesticide drift is a constant 3 mph wind. When wind speeds are consistent and relatively low, they do not contribute to the disruption or movement of pesticide particles away from the target application area.

In contrast, high humidity can actually affect the way pesticides behave in the air, potentially allowing droplets to coalesce and change size, influencing drift patterns. Turbulent air conditions can create unpredictable movements in the air, leading to increased drift as pesticide particles are lifted and carried away from the intended target. Temperature fluctuations can also impact pesticide behavior, as changes in temperature can affect air density and the stability of pesticide droplets, leading to drift.

Hence, a steady and low wind speed, like a constant 3 mph, remains a stable condition that minimizes the risk of drift, making it the correct choice in this context.