IH Monitoring

The requirement for the number of consecutive Industrial Hygiene (IH) sampling results that must be below the OSHA Permissible Exposure Limit (PEL) before moving to maintenance monitoring (typically once per year) can vary depending on the specific guidelines or policies of the organization and the type of substance being monitored. However, a common industry practice is as follows:

• A minimum of three consecutive sampling results should be below the OSHA PEL to consider transitioning to a less frequent monitoring schedule, such as maintenance monitoring.

These samples should be representative of normal operating conditions, and there should be no significant changes in processes, controls, or materials that could affect exposure levels.

It's important to verify the exact requirements with your organization's IH policy or specific regulatory guidelines applicable to your industry.