It is a legal requirement for all relevant UK employers to conduct breathing air quality tests to ensure the safety of their employees. In the UK, EN12021 advises that samples should be taken and analysed at least every three months or more frequently if there has been a change in, or any concerns relating to, the production process.
In the HSE guideline document Respiratory Equipment at Work (HSG53) it states the frequency of such tests should be based on a risk assessment, should take place at least every three months and more often when the quality of air cannot be assured to these levels.
For mobile breathing-air compressors, COSHH strongly recommends that for mobile compressors the air quality is tested whenever the unit is first moved into a new position or if prevailing wind conditions change.
EN12021:2014 is now the standard to indicate contaminant levels for breathing air both in the UK and in the EU expressed as “in any event all contaminants shall be kept to as low a level as possible and shall be below the national exposure limit“, but the following guide may help employers to know the specific regulations as they apply to a variety of industry requirements:
The exposure limits are now identified by the single term "workplace exposure limit (WEL)" which encompasses both long- and short-term exposure. Related to COSHH is a reference listing published annually under the identity EH40 "Occupational Exposure Limits". The listings are in addition to those in COSHH. Where any doubt exists as to the limits for any contaminant then this should be used as a start point.
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