A full list of substances assigned occupational exposure limits can be found in HSE's publication EH 40 occupational exposure limits. HSE guidance note EH 42 sets out the principles for measuring and recording occupational exposure limits.

Where exposure monitoring is required it should be suitable and carried out every 12 months unless in the case of those substances listed in schedule 4 of these regulations more frequent monitoring is required.

Where employees are performing the same task and therefore exposed to the same risks then sample monitoring on the group can be carried out, provided it is representative for each individual within the group.

To be suitable the record should show:

• when the monitoring was done and the results
• when monitoring procedures were adopted, including the duration
• the locations where sampling was taken
• the operation in process at the time
• the names of individuals concerned

Monitoring records should be readily available, in an easy to understand format and should be written in such a way that they can be compared with health records. The records should also be made readily available to the employee, their representatives or inspectors.

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