Which formulation poses the greatest inhalation danger to the applicator?

• A. DF
• B. E or EC
• C. SC
• D. W or WP

Answer: (D)

The form that creates the most airborne dust is the wettable powder. Wettable powders are finely ground solids that can easily become a dusty cloud during handling—pouring, scooping, mixing, or even just stirring can release respirable particles into the air. Those tiny particles can be inhaled deeply into the lungs, making inhalation exposure a major concern with this type of formulation.

Emulsifiable concentrates and suspension concentrates are liquids or suspensions in water, so they don’t generate as much dry dust as a true powder. Dry flowables are powders too, but they’re designed to flow with less dust than a typical wettable powder, so the inhalation risk is generally lower than with a wettable powder.