Which of the following is a potential environmental impact from outdoor pesticide application?

• A. Human exposure
• B. Increased crop yield
• C. Improved soil fertility
• D. Decreased pest diversity

Answer: (A)

Outdoor pesticide use can create exposure risks for people, making human exposure a key potential environmental impact. When pesticides are applied outside, they can drift with the wind, volatilize into the air, or leave residues on surfaces, soil, or water. People can encounter these chemicals through inhalation of spray drift, skin contact with treated surfaces, contaminated water, or residues on foods. This exposure risk is a direct environmental concern because it involves non-target organisms (including humans) and the potential for adverse health effects.

The other outcomes describe production or ecological changes rather than a direct exposure risk to people. Increased crop yield is a production benefit, not an environmental harm. Improved soil fertility is a soil health benefit. Decreased pest diversity is an ecological effect, but the most immediate and common environmental impact highlighted in outdoor use discussions is the potential for human exposure.