True or False: It is advisable to wear a respirator when mixing soluble or wettable powders.

Wearing a respirator when mixing soluble or wettable powders is advisable because these types of pesticides can release aerosols and dust that may be inhaled, posing health risks to the applicator. Many of the components in soluble or wettable powders can be harmful if inhaled, leading to potential respiratory issues or other adverse health effects.

Using a respirator not only provides a physical barrier to filter out harmful particles from the air but also is a critical safety measure according to best practices in pesticide application. A respirator can help ensure that the applicator is protected, especially in an environment where the formulation produces fine particles that can remain airborne.

Other options suggest different scenarios where one might think a respirator is not necessary, but they underestimate the potential risks associated with inhaling pesticide powders. The respiratory protection is a standard and prudent practice regardless of weather conditions or the known toxicity of the chemicals being handled.