Frequency of monitoring?
The suggested time between air monitoring depends upon the chemicals present in the workplace and the risks involved. For example, general dust and more inert compounds may require air monitoring every two years. Also, where previous surveys of the workplace air show good control of exposure, monitoring could be less frequent. Whereas more volatile substances or substances which are present in large quantities may require monitoring every year. In the same way, where the risk of exposure or risk of severe health effects is present, companies may require more frequent monitoring. Furthermore, any change in processes or substances handled within a facility should also prompt another workplace air survey. It is also best practice to repeat the test after a failure, change or renewal of control measures in place.