What signage must be posted to prohibit smoking in areas of fire hazard?

The signage that must be posted to prohibit smoking in areas of fire hazard is "No Smoking or Open Flame." This specific wording is effective because it clearly communicates two critical safety restrictions: the prohibition of smoking and the prohibition of open flames. In environments where fire hazards are a concern, it is essential to address both potential sources of ignition.

The inclusion of both prohibitions in one sign enhances the effectiveness of fire safety measures, ensuring that individuals are fully aware of multiple risk factors that can lead to fire incidents. This comprehensive approach helps set clear expectations and promotes a safer environment.

While other options may address various aspects of fire safety or smoking, they either do not mention both smoking and open flames together or lack the clarity needed for maximum impact in fire hazard areas. The more precise and informative the sign, the better it serves to prevent possible fire hazards.