Primary keyword: silica exposure standard Australia
Slug: silica-exposure-standard-australia
Meta title: Silica Exposure Standard Australia — WES & WEL Explained | OccHygiene
Meta description: What is the silica WES in Australia? How does it compare to international standards? What is the proposed WEL change in December 2026? Everything employers need to know.
Schema: Article + FAQPage
Word count target: 1,000
Introduction
The silica exposure standard is the benchmark against which all silica dust monitoring results are measured. Understanding what the standard is, what it means, and how it may change is fundamental to managing crystalline silica risks and interpreting your monitoring results correctly.
This article explains Australia’s current and proposed exposure standards for respirable crystalline silica, how they compare to international benchmarks, and what they mean for your business.
What Is a Workplace Exposure Standard (WES)?
A Workplace Exposure Standard (WES) is an airborne concentration limit that sets the maximum permissible time-weighted average (TWA) exposure for a worker over an 8-hour shift. The WES is set at a level below which the great majority of workers can be exposed repeatedly, day after day, without experiencing adverse health effects.
The WES is not a “safe” level in the absolute sense — it is a regulatory ceiling. The duty of care under WHS legislation goes further: employers must reduce exposure to as low as reasonably practicable (ALARP) — which requires you to measure your workers’ actual exposure, not estimate it. Simply remaining below the WES is not sufficient.
Australia’s Current WES for Crystalline Silica
Current WES: 0.05 mg/m³ (8-hour TWA)
This applies to:
– Quartz (the most common form of crystalline silica, found in concrete, sandstone, granite, and most rock types)
– Cristobalite (a form of crystalline silica found in some refractory materials and volcanic rocks; also has a WES of 0.05 mg/m³)
– Tridymite (least common; also 0.05 mg/m³)
The WES is measured as the respirable fraction — particles small enough to penetrate deep into the lung — not total dust.
Under WHS Chapter 8A (effective September 2024), employers are required to:
– Assess whether workers could be exposed above 50% of the WES (0.025 mg/m³) — triggering a monitoring obligation
– Conduct atmospheric monitoring and implement controls to reduce exposure to ALARP
– Report exceedances to the regulator within 14 days
The Proposed Change: WEL and December 2026
Safe Work Australia is currently reviewing the occupational exposure framework — see the December 2026 WEL transition: employer guide — for crystalline silica, with a transition from Workplace Exposure Standards (WES) to Workplace Exposure Limits (WEL) expected in December 2026.
The proposed WEL for respirable crystalline silica is 0.025 mg/m³ TWA — half the current WES.
This would represent a significant change:
– Results that are currently at 60–80% of the WES (0.03–0.04 mg/m³) would become WEL exceedances
– Many operations with “acceptable” results under today’s standard would require immediate control improvements
– Workers currently at the lower end of compliance would need re-evaluation
The proposed change aligns Australia with the direction taken by the United States (OSHA limit: 0.05 mg/m³, with a PEL under review) and moves toward the European standard of 0.1 mg/m³ as a minimum, with many EU member states applying lower national limits.
What employers should do now: If your monitoring results consistently sit between 0.025 and 0.05 mg/m³, you should begin strengthening controls today, before the WEL transition makes those results non-compliant. Our WEL 2026 employer guide explains the transition in detail.
Victoria’s Additional Target
Victoria applies the national WES of 0.05 mg/m³ as the legal ceiling but recommends employers aim for a best-practice target of 0.02 mg/m³ — an even lower concentration. This is guidance rather than a legal obligation, but WorkSafe Victoria uses it as a benchmark in assessing whether an employer has reduced exposure to ALARP.
How Does Australia’s Standard Compare Internationally?
| Jurisdiction | Standard | Value |
|---|---|---|
| Australia (current WES) | 8-hr TWA | 0.05 mg/m³ |
| Australia (proposed WEL 2026) | 8-hr TWA | 0.025 mg/m³ |
| United Kingdom | WEL | 0.1 mg/m³ |
| United States (OSHA PEL) | PEL | 0.05 mg/m³ |
| United States (NIOSH REL) | REL | 0.05 mg/m³ |
| European Union (OEL) | OEL | 0.1 mg/m³ |
| Germany | AGW | 0.05 mg/m³ |
| ACGIH (TLV) | TLV-TWA | 0.025 mg/m³ |
The American Conference of Governmental Industrial Hygienists (ACGIH) — which sets science-based threshold limit values — already recommends 0.025 mg/m³, the same level Australia is proposing for 2026. This reflects the weight of scientific evidence that silicosis risk is not eliminated at the current 0.05 mg/m³ standard.
What “ALARP” Means in Practice
The exposure standard is a ceiling, not a target. The ALARP principle (as low as reasonably practicable) means you must keep reducing exposure even if you’re already below the WES — unless the cost of further reduction is grossly disproportionate to the benefit.
In practice, this means:
– If your workers are at 0.04 mg/m³ and wet cutting would reduce them to 0.015 mg/m³ at minimal cost, you must implement wet cutting
– If engineering controls have brought results to 0.010 mg/m³ and further reductions would require disproportionate expenditure with minimal health benefit, ALARP may be demonstrated at that level
– Documentation of your control decision-making process is part of demonstrating ALARP
Frequently Asked Questions
Is the WES for silica the same for all types of crystalline silica?
Australia’s current WES of 0.05 mg/m³ applies to quartz, cristobalite, and tridymite. Some older guidance materials listed different values — the unified standard of 0.05 mg/m³ for all forms took effect on 1 July 2020, when Safe Work Australia halved the previous quartz WES of 0.1 mg/m³.
What does 0.05 mg/m³ actually look like?
Respirable crystalline silica at exposure standard levels is invisible to the naked eye — this is part of what makes it so dangerous. You cannot see whether a task is generating hazardous dust concentrations without measurement equipment. This is exactly why atmospheric monitoring is required by law.
When will the WEL take effect?
The transition from WES to WEL is anticipated in December 2026, following the scheduled review cycle. Employers should monitor Safe Work Australia’s communications for the confirmed implementation date and any transitional arrangements.
Learn about monitoring against the WES → | WEL 2026 employer guide → | Request a quote →
Information in this article reflects Safe Work Australia’s exposure standards framework as of 2026. Standards are subject to revision — verify current values with Safe Work Australia or your state WHS regulator.
