Removal of workplace exposure limits for non-threshold genotoxic carcinogens

During the development of the Workplace exposure limits for airborne contaminants (WEL list), some airborne contaminants were identified as non-threshold genotoxic carcinogens (NTGCs). Exposure to these chemicals can cause genetic damage and may lead to cancer.

Unlike other airborne contaminants, a practical, protective exposure level cannot be assigned for NTGCs due to limited data and the nature of their effects. Therefore, exposure limits have not been specified in the WEL list for chemicals identified as NTGCs. 

These chemicals pose a significant risk to workers. Persons conducting a business or undertaking (PCBUs) must eliminate risks from NTGCs so far as is reasonably practicable. If elimination is not reasonably practicable, PCBUs must use the hierarchy of control measures to minimise those risks so far as is reasonably practicable. This includes, where possible:

• substituting for less hazardous chemicals, or
• isolating workers and others from exposure to NTGCs. 

If neither of these are reasonably practicable, PCBUs must use engineering controls to minimise exposure. Remaining risks should be minimised using administrative controls and personal protective equipment.

There is no requirement to conduct air monitoring for NTGCs; however, a PCBU may conduct air monitoring to ensure that control measures are effective at minimising exposure to NTGCs so far as is reasonably practicable. 

NTGCs are included in Appendix B of the Workplace exposure limits for airborne contaminants.

Related information

• Workplace exposure limits for airborne contaminants (WEL list)
• Airborne contaminants
• Hierarchy of control measures
• Resources in this collection