What is the recommended action if fiber levels outside of containment approach 50% of the OEL?

When fiber levels outside of containment approach 50% of the Occupational Exposure Limit (OEL), the recommended action is to stop work immediately. This is crucial for maintaining the health and safety of workers, as exposure to hazardous fibers can pose significant health risks, including respiratory issues and other serious long-term effects.

Stopping work promptly allows for an immediate assessment of the situation, ensuring that appropriate control measures can be implemented, such as improving containment or ventilation, or reassessing the tasks being performed. This quick response is key to preventing further exposure and protecting the workforce's health.

The OEL is designed as a protective limit; thus, approaching 50% signifies a level of concern that requires immediate action rather than waiting until the end of the day or attempting to manage the situation through increased ventilation or unreported notices to supervisors. Such proactive measures contribute to a safer work environment and compliance with health regulations.