Which liquid pesticide formulation may approach 100% active ingredient?

The correct choice is the ultra-low volume (ULV) pesticide formulation. ULV formulations are designed to deliver a very concentrated form of pesticide with a minimal amount of solvent, which allows for high levels of active ingredient per unit volume. This means that they can often approach 100% active ingredient, which makes them highly effective for particular applications, such as in vector control for mosquitoes or other pests in large outdoor areas.

The high potency of ULV formulations enables them to be applied in small quantities, minimizing exposure to non-target organisms and reducing environmental impact while maximizing the effectiveness of the treatment. This makes ULV an important option where precision and concentration are critical.

In contrast, aerosol formulations typically contain propellants and other additives that dilute the active ingredients, while emulsifiable concentrates and suspensions are formulations designed to stabilize their active ingredients in a liquid medium, typically resulting in lower concentrations of the active ingredient compared to ULV.