By Niru Tyagi
A complete chemical register can still leave workers’ airborne exposure unexplained. Australia’s exposure-limit transition is the moment to test whether your monitoring represents the work being done and whether controls provide the protection expected.
The products are listed, safety data sheets are available and training is complete. Yet nobody can explain what happens when a vessel is opened, a filter is changed or a contractor cleans equipment after production finishes.
That gap deserves attention before Australia’s agreed transition to workplace exposure limits on 1 December 2026. Current workplace exposure standards continue to apply until 30 November. Implementation occurs through Commonwealth, state and territory laws, so confirm the arrangements with your relevant regulator.
My recommendation is to organise preparation around tasks with uncertain exposure. Updating the register is necessary, but the decision that matters is whether people are adequately protected while doing the work.
Check what changes for your operations
The existing workplace exposure standards are already limits that must not be exceeded. The change of name does not introduce the underlying duty to control exposure. The revised list includes changes to numerical values, substance groupings and advisory notations. Some values increase; others decrease. Check each relevant listing.
Thirty-three non-threshold genotoxic carcinogens appear in a separate list without numerical exposure limits. Their removal from the numerical list does not remove the duty to eliminate or minimise risk. Do not interpret an absent number as permission to accept uncontrolled exposure.
For each contaminant used or generated, record the applicable limit, the work that creates exposure and the evidence supporting the current controls. This gives the transition review a practical purpose beyond changing a spreadsheet heading.
Follow the task beyond normal production
A purchasing list cannot capture every airborne contaminant. Work processes can generate dusts, gases, fumes, vapours and mists. Include maintenance, cleaning, breakdowns and shutdowns when reviewing exposure.
Ask workers where extraction is awkward to position, when lids remain open and which tasks leave residues. Include nearby workers and contractors. Identify the circumstances an earlier assessment did not cover.
Consider a hypothetical fabrication workshop. Its monitoring report covers a typical production shift. Since that assessment, a new component has changed the welding task, overtime has increased and a contractor now cleans the area at night. The report remains useful historical evidence. Its findings need to be checked against those changes before management relies on them.
Record the changed task, exposed group, existing control and unanswered question. Give each question an owner who can obtain the evidence or authorise a change to the work.
Make monitoring answer a defined question
An eight-hour time-weighted average, a short-term exposure limit and a peak limitation address different exposure patterns. Where several apply, meeting one does not establish compliance with the others. Extended shifts can also require specialist interpretation and adjustment.
In the workshop example, a full-shift result might help assess average exposure while leaving uncertainty about a brief cleaning task. Personal exposure monitoring measures contaminants in the worker’s breathing zone; a stationary reading elsewhere may answer a different question.
Under the model WHS requirements, air monitoring is required where there is uncertainty on reasonable grounds about an exceedance, or where monitoring is necessary to determine a health risk. A competent person should conduct it, such as an occupational hygienist.
Explain the decision the assessment must support. Identify changed tasks, potentially overlooked workers and conditions under which controls perform poorly. Ask the report to state what was assessed, what was excluded and what its findings can reasonably establish.
Safe Work Australia’s July 2026 guide for businesses supports preparation for the new limits. Use it alongside the current requirements during the transition and the technical advice needed for your operations.
Check control performance in the workplace
Exposure below a numerical limit does not guarantee protection for every person. The duty to eliminate risk where reasonably practicable, and otherwise minimise it so far as reasonably practicable, continues.
Review whether the hazardous process can be removed, a safer material used, or the source enclosed and effectively extracted. Assess any new hazards introduced by a substitute.
For an extraction system, establish whether it captures contaminants where they arise, whether workers can position it correctly and how deterioration is detected. Specify the performance evidence needed when commissioning or reviewing the system. A maintenance record should be read alongside that evidence.
Respiratory protection may remain necessary. Suitable selection, fit testing for tight-fitting respirators, maintenance and correct use all matter. Health monitoring, where required, serves a different purpose from air monitoring and does not replace exposure control.
Consult workers before finalising changes. If a proposed hood obstructs access to the task, resolve that design problem before installation. Check performance afterwards under the operating conditions for which the control was selected.
Make the next decision explicit
Start with the tasks presenting the greatest potential harm and uncertainty. Agree the necessary interim protection, the permanent improvement and who has authority to deliver it. Make the exposure implications of a delayed purchase or maintenance decision visible to management.
Keep procurement and production changes within the review. A replacement formulation, different application method or longer shift can change the basis of an earlier assessment. Allocate responsibility for recognising those changes before work proceeds.
At the next operations meeting, select one task with uncertain exposure. Ask which limit applies, what evidence is missing and what protection is in place while the uncertainty is resolved. Record the decision, owner and completion date.
Before declaring readiness, be able to explain how the evidence covers the people, tasks and shifts actually present in your workplace.
Niru Tyagi is a senior WHS consultant with over 20 years’ experience across Australia and South Asia, including high-risk environments such as emergency services and marine rescue. She helps organisations turn complex safety challenges into practical action, combining expertise in governance, psychosocial risk and safety leadership with a clear understanding of operational pressures. Holding a Master’s in Occupational Health and Safety Science, Tyagi brings a commercially grounded approach to protecting people, strengthening safety culture
