Which of the following is a key factor in determining the potential toxicity of a pesticide product?

The concentration of the active ingredient in a pesticide product is a critical factor in determining its potential toxicity. This is because the active ingredient is the component responsible for the pesticide's efficacy against pests, and its concentration directly correlates with the level of exposure that non-target organisms, including humans, pets, and beneficial insects, may experience.

Higher concentrations of active ingredients generally have a greater potential for causing harmful effects in non-target organisms. Therefore, understanding the concentration allows for better assessments of both efficacy and safety, influencing decisions about application rates and potential risks associated with the pesticide's use. Knowing this helps in crafting appropriate handling guidelines and safety precautions necessary when working with pesticides.

Other factors may play roles in determining toxicity, but they do not carry the same direct relationship to the chemical specifics of the pesticide itself. For instance, while the method of application can affect how the pesticide behaves in an environment, it does not inherently change the chemical properties that dictate toxicity.