Airborne contaminants remain one of the most significant health risks across Australian workplaces. From construction sites and workshops to manufacturing floors, waste facilities and water treatment plants. With the transition from Workplace Exposure Standards (WES) to Workplace Exposure Limits (WEL) taking effect on 1 December 2026, employers will face a new compliance landscape that is more stringent, more evidence‑based, and legally enforceable.
This shift reflects updated scientific understanding of how airborne contaminants affect worker health, including long‑term respiratory disease, cancers, and chronic conditions. It also acknowledges that exposure risk is influenced by more than just concentration but factors such as shift length, frequency of exposure, individual health, and recovery time all play a role.
What You Need to Know
- Exposure limits become legally enforceable, not advisory. PCBUs must ensure no worker is exposed above the WEL, and must be able to prove it.
- Lower limits + new substances. 31 contaminants have been added with new health‑based limits, and 33 non‑threshold genotoxic carcinogens have had exposure limits removed entirely.
- Nine chemicals remain unchanged, including respirable crystalline silica (RCS).
- Six prohibited contaminants are not included in the WEL list.
- From 1 June 2027, the WEL for benzene will be reduced from 1 ppm to 0.2 ppm as benzene is recognised as a known human carcinogen with the potential for serious health outcomes for workers exposed to it. As it is not until June 2027, this provides employers and industries time to review monitoring and compliance arrangements and implement necessary controls.
- Compliance burden increases. PCBUs must demonstrate compliance through air monitoring, health monitoring, engineering controls, documentation, and worker consultation.
- Risk isn’t just the number. WEL values are not a “safe/unsafe” line. Individual susceptibility means some workers may still experience harm below the limit.
- Industries most affected: Construction, mining, manufacturing, waste management, water treatment, and any workplace generating dusts, fumes, vapours, fibres or mists.
WorkSafe WA reinforces that airborne contaminants may be invisible but can cause serious harm including asthma, COPD, cancers, mesothelioma, and silicosis. Many diseases develop slowly, making early control and monitoring essential.
What Employers Need to Do
The WEL list replaces the WES list. Where limits have been lowered, operations that comply today may not comply under the new framework. Safe Work Australia and WorkSafe WA outline a clear pathway for employers:
1. Identify significant‑risk substances
Review your chemical inventory, SDSs, and processes. Identify contaminants generated by:
- cutting, grinding, drilling, sanding
- welding, brazing, soldering
- spraying, painting, abrasive blasting
- cleaning, waste handling
- hot processes or machinery that generates fumes
2. Assess and monitor airborne contaminants
If you are unsure whether exposures exceed the new limits, air monitoring is required. Safe Work Australia recommends engaging a competent person, such as an occupational hygienist, to conduct monitoring and interpret results.
3. Strengthen engineering and administrative controls
Follow the hierarchy of controls:
- eliminate hazardous processes where possible
- substitute safer materials
- isolate or enclose processes
- improve ventilation and extraction
- implement administrative controls and PPE only as a last resort
4. Review health monitoring requirements
Where workers may be exposed to hazardous chemicals or carcinogens, health monitoring may be mandatory. If new controls are implemented, exposures should be reassessed to confirm effectiveness and then ongoing health monitoring becomes part of your routine compliance.
5. Update documentation and training
Employers must:
- update risk assessments
- revise safe work procedures
- ensure workers understand new hazards and controls
- maintain training and monitoring records
- consult workers throughout the process
RediMed’s Perspective
For most businesses, the shift from Workplace Exposure Standards (WES) to Workplace Exposure Limits (WEL) will strengthen existing responsibilities rather than introduce an entirely new approach to managing airborne contaminants.
The transition is however, an ideal moment to review whether your current controls, monitoring programs and WHS documentation remain fit‑for‑purpose. It’s also important not to assume every exposure limit is changing. Safe Work Australia’s WEL comparison table outlines exactly which limits and listings have been updated, while the full WEL list confirms the values that apply from 1 December 2026.
For substances such as respirable crystalline silica (RCS), employers should rely on the latest confirmed information rather than earlier proposals. The RCS exposure limit will remain 0.05 mg/m³ (8‑hour TWA) from 1 December 2026.
Rather than waiting for the implementation date, we recommend you to start preparing now to ensure a smooth transition and avoid disruption to operations.
Key Takeaways
The introduction of WEL marks a clearer, more enforceable standard for managing airborne contaminants. It’s a chance for you to step back, reassess your current approach and confirm that controls genuinely match the risks present in your unique environment.
These are the themes we recommend employers focus on:
- The new WEL framework becomes mandatory on 1 December 2026, with WES requirements remaining in place until the end of November.
- Only selected substances have updated limits – businesses should rely on the official WEL list and comparison table rather than assuming broad changes.
- Respirable crystalline silica remains at 0.05 mg/m³ (8‑hour TWA), reflecting the confirmed national position.
- Noise exposure requirements are unchanged, with the existing standards continuing to apply.
- Risk controls, monitoring programs and WHS documentation may need refinement, especially where exposure potential is high or work processes have evolved.
- Worker understanding is critical – training should reflect the new terminology and reinforce that WELs are limits that must not be exceeded.
By taking stock of your current systems, tightening controls where needed and ensuring workers are prepared for the shift, your organisation can move into the WEL era with confidence and continuity.
As an end-to-end healthcare provider, RediMed partners with thousands of organisations across Australia to review workplace risk, reduce workplace-related illnesses/injuries and improve recovery outcomes. If you would like to review your current health monitoring program or learn more about our health monitoring service, please contact customer@redimed.com.au. RediMed’s experienced occupational health team can help you prepare for the compliance changes, protect your workforce, and ensure your business is ready for the WEL transition.
Where to Find More Information
- Workplace Exposure Limits (WEL) list and transition guidance: Safe Work Australia — www.safeworkaustralia.gov.au
- Site‑specific advice from occupational hygienists: Australian Institute of Occupational Hygienists — www.aioh.org.au
This information is provided as general guidance only and should not be considered as legal or medical advice.
