Containers for hazardous waste should be...

Containers for hazardous waste should be closable and appropriately labeled to ensure safety and compliance with regulatory standards. Proper labeling provides critical information about the waste material, including its contents and any associated hazards, which is vital for handling and emergency response. Having closures on the containers minimizes the risk of accidental spillage or exposure to the waste, protecting both individuals and the environment. This practice helps prevent contamination and promotes a safer handling process within facilities that manage hazardous materials.

In contrast, the other options lack the safety and regulatory focus required for managing hazardous waste. For example, keeping containers open could lead to exposure to the hazardous materials, while storing them in public areas poses significant risks to uninformed individuals. Regular monitoring for leaks is important but secondary to the foundational requirement of having closable, labeled containers.