2. Define your homogeneous exposure groups (GEH)

Only a set of representative measurements can take into account the statistical variability of employee exposure. The notion of homogeneous exposure group (GEH) is therefore introduced. This is the same concept as that used for measuring the noise to which employees are exposed. A GEH corresponds to a group of employees with similar exposure (workers in the same workshop performing the same task, for example).

It seems logical to decide that GEHs correspond to the work units in your single risk assessment document. In practice, the GEH may correspond to a single employee.

The accredited organization is responsible for the sampling strategy, and establishes the GEHs in agreement with the employer.

Occupational health services, which used to carry out atmospheric measurements of chemicals, are not accredited to perform...