What must workers do when entering containment in the clean room?

When entering containment in the clean room, workers must adhere to strict protocols to minimize the risk of asbestos exposure and ensure safety. Putting on swim trunks or disposable underwear in addition to all personal protective equipment (PPE) ensures that the worker is fully protected from contamination while maintaining hygiene standards. The use of disposable materials helps prevent the transport of asbestos fibers out of the containment area, effectively controlling dust and maintaining a clean environment.

Personal protective equipment is crucial in this context because it normally includes items like respirators, gloves, coveralls, and eye protection, all designed to safeguard the worker's health against potentially hazardous materials. This comprehensive approach significantly reduces the chance of airborne fibers being inhaled or contacting skin, which is essential in any asbestos-related work environment.

The other choices fail to provide adequate levels of protection or adhere to safety protocols. For example, retaining street clothes can introduce contaminants into the clean room, while simply removing shoes would not be sufficient as it does not address body coverage or airborne risks.