Which type of particulate filter must be used when working with pesticides that contain oil?

• A. P series
• B. N series
• C. R series
• D. HEPA

Answer: (A)

When pesticides contain oil, you must use filters that resist oil aerosols. Filtration options are categorized by oil resistance: not resistant to oil, oil-resistant, and oil-proof. Not resistant to oil filters won’t hold up in oil-based environments, so they won’t provide reliable protection. Oil-resistant filters can handle oil aerosols for a while but aren’t designed for prolonged exposure, so their performance declines over time. Oil-proof filters, on the other hand, are designed specifically to resist oil-based aerosols and maintain protection over longer periods in oil-containing environments. Therefore, the best and required choice is the oil-proof filter. HEPA filters describe high efficiency for many particles but don’t inherently specify oil resistance for this use case, so they’re not the correct fit here.