If they are, the farmer must use a respirator or pre-filter with an R or P designation. The R filters are protective against oil-based contaminants for eight hours. The P filters may last longer, so farmers should follow the filter manufacturer's instructions. The 95 percent efficient filters can be used for most applications. The 99 percent efficient filters are available, but many respirator manufacturers have chosen not to produce them because they are so close in efficiency to the 100 filters.
Most farmers do know if they are using oil or water-based pesticides.
If they are unsure and don't want to contact the pesticide manufacturer, they will be safe with a P100 filter for both oil and non-oil mists. As NIFS members, we are in a position to help farmers understand the importance of using the proper respiratory protection. Extension safety specialists, respirator suppliers and respirator manufacturers are all good sources for additional information. We must remain aware of factors that determine the health of our organization and strive to develop, nurture and prioritize those areas. Our broad purpose is to promote a safer and healthier agriculture through dedication to the professional development of our members.