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Air temperature and relative humidity are critical atmospheric conditions that can significantly influence pesticide drift. When pesticides are applied from the air, their effectiveness and behavior in the environment can be affected by temperature and humidity levels. Higher temperatures can increase the evaporation rate of aerosolized particles, which may lead to more rapid drift away from the target area. Additionally, low relative humidity can exacerbate this effect by allowing droplets to evaporate quickly, increasing the risk of drift. Conversely, higher humidity might help retain the size of the droplets longer, reducing drift potential.

In contrast, other options do not relate to the immediate atmospheric conditions impacting pesticide behavior. The mean distance from the earth to the sun is irrelevant to local pesticide drift, as it concerns astronomical positioning rather than atmospheric behavior. Wind direction is also a factor but is not the sole influence, making the choice that focuses on air temperature and relative humidity more comprehensive in addressing the various ways conditions can affect pesticide application and drift. Thus, selecting the combination of air temperature and relative humidity as factors influencing drift is the most appropriate response.