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Local ventilation is the standard way of dealing with dusts, vapours and fumes which arise from point sources, eg in grinding, cutting, welding and burning.
Local exhaust ventilation (LEV) removes contaminated air from the source of the hazardous substance, thus reducing exposure.
These techniques are primarily aimed at reducing exposure of dust and vapour in the air and so tend to be considered as protecting the respiratory systems of workers. However, it should always be remembered that dusts settle and vapours condense on surfaces, thus putting the worker at risk from skin contamination. This is an area that is often neglected when people consider the Control of Substances Hazardous to Health Regulations 2002 (as amended).
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