Key takeaway
What This Development Means
Australia’s new exposure-limit guidance gives employers a practical route to the 1 December transition. Businesses should reconcile contaminant inventories, identify changed values, assess diesel particulate risks, appoint competent monitoring support and improve controls. They must also confirm implementation under each applicable Commonwealth, state or territory work health and safety law.
When Do Australia Workplace Exposure Limits Apply?
The transition date is 1 December 2026, following implementation through Commonwealth, state or territory work health and safety law. Existing exposure standards remain applicable until 30 November. Employers should confirm their jurisdiction’s legislation and regulator guidance rather than relying only on model materials. Local implementation instruments should also be checked.
What Is The New Diesel Particulate Matter Limit?
A workplace exposure limit of 0.01 mg/m³ applies from 1 December 2026. Businesses using diesel engines should identify sources, evaluate enclosed or poorly ventilated work, consider cleaner equipment, review engineering controls and obtain competent advice on air and health monitoring where required. Retain monitoring evidence and control decisions.
Source basis: Safe Work Australia, New guidance on managing workplace exposure to airborne contaminants (30 July 2026)
Safe Work Australia published three new guides on 30 July 2026 to help employers prepare for Australia workplace exposure limits applying from 1 December. The guidance covers employer duties, technical air monitoring and diesel engine emissions, giving manufacturers, mines, logistics operators, construction businesses, farms and maintenance organisations four months to test exposure controls and evidence.
From 1 December, duty holders must ensure nobody at work is exposed above a value in the new workplace exposure limits list, after implementation through Commonwealth, state and territory work health and safety laws. Until 30 November, existing workplace exposure standards continue to apply. The guidance is practical support, while enforceable duties arise under the relevant jurisdiction’s legislation.
Diesel Particulate Matter Receives A Measurable Limit
A new limit of 0.01 mg/m³ for diesel particulate matter applies from 1 December 2026. Diesel particulate matter is used as the measure of exposure to diesel engine emissions, which Safe Work Australia links to serious health effects including lung disease and cancer.
The diesel guide addresses mining, quarrying, tunnelling, construction, agriculture, transport and logistics, oil and gas, and vehicle maintenance. Similar exposure scenarios can arise in factories, warehouses, ports and enclosed loading areas where diesel equipment or vehicles operate.
Businesses should identify emission sources, review ventilation and isolation, consider cleaner equipment or fuels, and determine whether air or health monitoring is required. Personal protective equipment should sit within a wider control strategy, not replace elimination or minimisation where reasonably practicable.
Air Monitoring Evidence Becomes A Management Priority
The PCBU guide explains when air monitoring may be needed, how to appoint a competent person, and how to interpret and respond to results. A separate technical guide supports occupational hygienists in planning measurements, assessing exposure and reporting advice consistently.
Australia workplace exposure limits also change values, names and notations for numerous substances. Thirty-three non-threshold genotoxic carcinogens will no longer have numeric exposure limits. Duty holders must eliminate them, substitute safer alternatives where possible, or reduce risk as far as reasonably practicable.
Manufacturers should reconcile chemical inventories and safety data sheets with the final list, prioritise substances with changed values, and document decisions before December. Global employers can use the transition to align industrial-hygiene systems, but must still confirm the precise implementing law and regulator position in each Australian jurisdiction.
Summary
Australia’s new exposure-limit guidance gives employers a practical route to the 1 December transition. Businesses should reconcile contaminant inventories, identify changed values, assess diesel particulate risks, appoint competent monitoring support and improve controls. They must also confirm implementation under each applicable Commonwealth, state or territory work health and safety law.
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