Which factor affects how much pesticide your skin absorbs?

• A. The chemical's properties
• B. The level of physical activity
• C. The time of day
• D. The color of the container

Answer: (A)

The amount of pesticide that passes into the skin is determined mainly by the pesticide’s own properties—specifically, how easily it can move through the skin’s outer barrier. The skin’s outer layer is rich in lipids, so molecules that are small and moderately lipophilic tend to partition into that layer and cross into the deeper tissues more readily. A pesticide’s molecular size, how soluble it is in fats versus water, and whether it tends to ionize at skin pH all shape its ability to permeate. The formulation also matters: solvents or surfactants can help carry the chemical into the skin or disrupt the barrier, increasing absorption. Because these chemical characteristics set the baseline for how much can be absorbed, they’re the key factor here.

Other factors like how physically active you are, what time of day it is, or the color of the container don’t change the chemical’s permeability in the same fundamental way. They can influence exposure in indirect ways (for example, more sweating or longer contact time can affect how much contact occurs), but they don’t determine how readily the pesticide itself crosses the skin barrier.