Australia's New Workplace Exposure Limits (WEL)

What industrial businesses need to know before 1 December 2026

A New Standard for Workplace Air Quality

Australia is entering a new chapter in workplace health and safety.

From 1 December 2026, the current Workplace Exposure Standards (WES) for airborne contaminants will transition to Workplace Exposure Limits (WEL) across Australia. The change aims to provide greater clarity that exposure limits are values that should not be exceeded and aligns Australia's approach with international health and safety practices.

For manufacturers, warehouses, recycling facilities, workshops, mines, and industrial processing plants, the changes reinforce a growing focus on controlling airborne contaminants and protecting worker health.

What Are Workplace Exposure Limits (WEL)?

Workplace Exposure Limits establish the maximum concentration of airborne contaminants that workers may be exposed to during a specified period. From 1 December 2026, businesses will be required to comply with the new WEL framework, which replaces the current WES system. While many exposure limits remain unchanged, numerous contaminants have been reviewed, resulting in new limits, revised limits, updated classifications, and additional health-related notations. The transition reflects increasing scientific understanding of how airborne contaminants can impact worker health and the importance of reducing exposure wherever reasonably practicable.

Diesel Particulate Matter: The Most Significant New Requirement

One of the most important changes is the introduction of a national Workplace Exposure Limit for Diesel Particulate Matter (DPM).

Effective 1 December 2026, the new limit will be:
0.01 mg/m³ measured as respirable elemental carbon.

Diesel particulate matter consists of microscopic particles produced by diesel engine combustion. These particles are small enough to penetrate deep into the lungs and have been linked to serious health risks, including respiratory disease and cancer. Diesel engine exhaust has been classified by the International Agency for Research on Cancer (IARC) as a Group 1 carcinogen.

Industries likely to be affected include:
•    Manufacturing
•    Mining
•    Warehousing and logistics
•    Recycling and waste management
•    Construction
•    Vehicle maintenance facilities
•    Heavy equipment operations

Particular attention should be paid to enclosed and semi-enclosed environments where diesel emissions can accumulate.

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Other Airborne Contaminants Under Increased Scrutiny

While DPM may be attracting the most attention, it is part of a broader shift towards tighter control of workplace air quality. The WEL review includes changes to various airborne contaminants commonly found in industrial environments, including combustion gases, fumes, and other workplace-generated pollutants. Safe Work Australia notes that exposure limits have been reduced, increased, introduced, or revised across numerous contaminants as part of the review process.

For industrial facilities, this highlights the growing importance of comprehensive air quality management rather than focusing on a single contaminant.

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Why Air Quality Matters More Than Ever

Airborne contaminants are often invisible, but their impact on worker health can be significant.

Exposure to dust, fumes, combustion by-products, and other contaminants may contribute to:

Respiratory irritation
Reduced lung function
Chronic respiratory conditions
Long-term occupational health risks
Reduced workplace comfort

Creating a cleaner working environment benefits both employees and business operations.

Healthier Employees

Cleaner air helps reduce worker exposure to harmful contaminants and supports long-term wellbeing.

Improved Productivity

A comfortable work environment can help employees remain focused and productive throughout the workday.

Stronger Compliance Position

Proactively managing airborne contaminants can help organisations meet regulatory obligations and prepare for future requirements.

Enhanced Workplace Reputation

Demonstrating a commitment to employee health and safety helps build trust with workers, customers, and stakeholders.

The Importance of Flexible Ventilation Infrastructure

As regulations evolve and facilities grow, ventilation systems must be able to adapt.

Modular ducting systems offer several advantages for facilities looking to improve air quality management:

Fast installation and modification
Easy expansion as operations change
Simplified maintenance and inspection
Reduced disruption during facility upgrades
Support for a wide range of extraction and ventilation applications

Whether managing diesel emissions, dust, welding fumes, or other airborne contaminants, having an adaptable extraction network can help facilities respond quickly to changing operational and regulatory requirements.

Preparing for 1 December 2026

Businesses should begin evaluating their exposure risks before the new Workplace Exposure Limits come into effect.

Key questions to consider include:
✅ Are airborne contaminants being captured at the source?
✅ Have diesel emissions been assessed within your facility?
✅ Are workers exposed to contaminants in enclosed or restricted spaces?
✅ Is your ventilation and extraction infrastructure still fit for purpose?
✅ Can your extraction system be expanded or modified as operational requirements change?
✅ Have workplace air quality risks been reviewed against the upcoming WEL requirements?

Need help preparing for the new WEL requirements? Our team can help you design or upgrade extraction systems that support cleaner air, improved operational efficiency, and greater flexibility for future changes.