Which of the following is a safety guideline when handling hazardous materials?

Clearing aisles and passageways is an essential safety guideline when handling hazardous materials. This practice helps ensure that employees can move freely and safely in their environment, reducing the risk of accidents and injuries. Obstructions can lead to tripping hazards or impede quick evacuation in emergencies, especially in areas where hazardous materials are present. Creating clear pathways allows for efficient responses to spills, leaks, or other dangerous situations that might arise during the handling of hazardous materials, thus enhancing overall workplace safety.

The other options do not align with safety protocols. For instance, storing incompatible substances together can lead to dangerous chemical reactions and is counterintuitive to maintaining a safe working environment. Raising the height of storage areas could create the risk of falling objects and injuries, while ignoring hazards compromises safety protocols and increases the likelihood of accidents and exposure to dangerous materials.