3. What are the two types of OELs?

The OELs defined by the Department of Labor following the work of a specialized commission led by the INRS are mostly "indicative." This means that they can be slightly exceeded temporarily without risk, due to the safety margin taken into account when establishing them. This leaves the theoretical possibility for those handling the substance to adapt to actual potential exposure conditions, with a tolerance of 10% to 30% being acceptable depending on the substance.

These "indicative" OELs are not necessarily applicable in the workplace. However, it is difficult, if not impossible, for manufacturers not to apply them in the workplace, as they are determined by a committee of specialized experts.

"Binding" OELs have also been defined. They require employers to strictly comply with these values in workplaces in the country concerned....