What is a low exposure factor (EF) in relation to worker exposure?

The correct answer is focused on the concept of reducing worker exposure through effective environmental control measures. A low exposure factor (EF) indicates conditions that minimize the harmful effects of environmental hazards to which workers might be exposed.

Using a fan or air cleaner and ensuring clean outdoor air ventilation effectively circulates fresh air and reduces concentrations of airborne contaminants. This approach not only improves indoor air quality but also minimizes the workers' exposure to potentially harmful substances, making the work environment significantly safer.

In contrast, factors such as utilizing high humidity levels indoors can sometimes exacerbate exposure to certain contaminants or create uncomfortable working conditions, thus not contributing to a low exposure factor. Exposing workers to direct sunlight can increase the risk of heat stress and other hazards, leading to higher exposure. Failing to use any ventilation systems would allow airborne pollutants to accumulate, increasing exposure risk rather than decreasing it. Therefore, the option of using a fan, air cleaner, and ensuring ventilation stands out as a definitive means of achieving a lower exposure factor for workers.