Which of the following is essential for safety when working with hazardous materials?

Proper ventilation is crucial for safety when working with hazardous materials. Many hazardous substances can emit vapors, fumes, or dust that may be harmful when inhaled. Ensuring adequate ventilation helps to dilute and disperse these potentially dangerous airborne contaminants, reducing the risk of inhalation and exposure.

While examining the container label is important for identifying the hazards associated with the material, proper ventilation addresses the immediate environmental risk associated with working around these substances. It is an essential safety measure that protects workers from the potential harmful effects of exposure to hazardous materials through the air.

The other options, such as wearing sunglasses, while beneficial in some scenarios, do not specifically mitigate the hazards associated with hazardous materials. Understanding market value does not relate to safety practices in handling these materials. Therefore, the importance of having proper ventilation is clear in the context of workplace safety and health.