The WHO Project on Recommended Health-based Limits in Occupational Exp
osure resulted in the development of occupational exposure limit (GEL)
values for a few groups of widely used industrial chemicals. A compar
ative analysis of the WHO-recommended OEL and existing OEL in selected
countries has been made. It was shown that in the OEL's development,
there is need for harmonization of methodology, approaches and definit
ions. Therefore, a new WHO project on guiding principles and guidance
values for health-based occupational exposure limits has been establis
hed.