Aptive Pest Control Practice Test

Heat stress rises when the body's ability to cool itself is impaired. Protective clothing that is chemical-resistant is typically impermeable and covers a large portion of the body, which reduces air flow and blocks sweat from evaporating. This traps heat and makes it harder for the body to shed heat during hot conditions or strenuous work, increasing the risk of heat-related illness.

Other choices would not raise heat-stress risk in the same way: working in the cooler morning reduces heat exposure; taking breaks in shade helps the body cool down; and applying organophosphate pesticides doesn’t inherently affect the body's heat-dissipation process, though it carries other safety concerns.