When is respiratory protection most often required when handling pesticides?

Respiratory protection is most often required during mixing and loading of pesticides because this stage typically involves exposure to concentrated formulations that may release harmful vapors, dust, or aerosols. These substances can be inhaled, leading to potential respiratory issues and other health hazards. Proper respiratory protection ensures that individuals are shielded from these airborne contaminants, which can be at their highest levels during these processes.

While respiratory protection is also essential during application, especially in enclosed areas or when applying highly volatile products, the mixing and loading stages are particularly critical due to the high concentrations of active ingredients present and the potential for immediate inhalation risks. Storing pesticides and cleaning equipment tend to pose lower risks for inhalation exposure compared to the mixing and loading processes, making these activities less likely to require respiratory protection.