Workplace Exposure Limits (WEL) December 2026: Silica, Dust and Construction Action Plan

Quick answer: From 1 December 2026, Australia adopts the Workplace Exposure Limits (WEL) list for airborne contaminants, replacing Workplace Exposure Standards (WES). PCBUs must ensure no worker is exposed above the WEL for each substance. Many limits are lower than today's WES — affecting respirable crystalline silica (RCS), wood dust, welding fumes and others common on construction sites. Until 30 November 2026, current WES still apply — but regulators expect transition planning now, especially where engineered stone bans (from 1 July 2024) already shifted industry focus to silica controls.

WES → WEL: what changed conceptually

Safe Work Australia renamed standards to limits to align with international terminology and emphasise: these are ceilings not to be exceeded, not "target" levels. The risk management process unchanged — eliminate → substitute → engineering → administrative → PPE.

Non-threshold genotoxic carcinogens (NTGCs): from 1 December 2026, 33 substances have no exposure limit — PCBUs must eliminate exposure so far as is reasonably practicable. Treat any exposure as requiring maximum control effort, not "under the WEL."

Silica — the construction headline (updated June 2026)

RCS remains a priority after the engineered stone prohibition (1 July 2024, all jurisdictions). Current WES for RCS: 0.05 mg/m³ (8-hour TWA) — this remains the legal limit until 30 November 2026.

Safe Work Australia proposed 0.025 mg/m³ for the WEL list. In June 2026, a majority of WHS ministers requested further impact analysis before adopting stricter limits for RCS and eight other substances (formaldehyde, benzene, chlorine, copper fumes/dusts, hydrogen cyanide, hydrogen sulphide, nitrogen dioxide, titanium dioxide). ABC reporting cited Safe Work Australia's Regulatory Impact Statement: implementing proposed limits could cost employers ~$31 billion over 10 years, while ongoing exposure at current limits carries substantial health costs.

Practical implication for builders: the 0.05 mg/m³ WES still applies through November 2026; the 0.025 mg/m³ figure is not yet law — but tier-1 specs and hygienists increasingly design controls to the lower benchmark anyway. Do not wait for legal change to install wet cutting, on-tool extraction and exclusion zones.

Construction activities generating RCS:

SafeWork NSW's Managing Risks of Respirable Crystalline Silica Code of Practice requires controls so far as reasonably practicable — RPE only after higher-order controls, and only with correct wear for exposure assessment.

Other WEL changes relevant to construction

Safe Work Australia's WES/WEL comparison tables show tighter limits for substances common on site — including wood dust (carpentry, formwork), welding fumes, and various solvents. Review the WEL list against your SDS inventory and task profiles.

WEL transition timeline

Hierarchy of controls for silica on site

SafeWork NSW's Managing Risks of Respirable Crystalline Silica Code (aligned to model framework):

RPE may be considered in exposure assessment only when higher-order controls are implemented and worn correctly — not as a first-line substitute for extraction.

FAQ

Do I need air monitoring on every cut? Not always — but monitoring is required where you cannot be certain on reasonable grounds exposure is below the WES/WEL. Many civil and demo projects use baseline and periodic monitoring.

Does silica work always need a SWMS? Often yes — demolition, confined space, or concurrent HRCW triggers Reg 291. Silica SWMS should document engineering controls per task step, not "wear P2 mask."

What changed with engineered stone ban? Manufacture/supply/installation of engineered stone benchtops banned from 1 Jul 2024 — remaining silica risk is mostly concrete, masonry, tiles, natural stone on construction sites.

What PCBUs should do before December 2026

1. Inventory hazardous substances — what tasks generate dust, fumes, vapours?

2. Baseline monitoring — air monitoring where exposure is uncertain; statistically valid data supports compliance demonstrations

3. Engineering controls audit — wet cutting, on-tool extraction, enclosed cabins, local exhaust ventilation

4. Update SWMS and permits — silica tasks documented with hierarchy of controls, not "wear PPE"

5. Training — workers understand invisible respirable fraction; health monitoring where required

6. Client / project requirements — CEMPs and tier-1 specs increasingly reference 0.025 mg/m³ planning even pre-legal change

SWMS and permit integration

HRCW categories may apply alongside silica tasks — demolition, confined space, mobile plant. Your SWMS should cross-reference:

AxionSite for silica and dust tasks on site

AxionSite gives construction teams the documentation edge ahead of the December 2026 WEL transition:

Site-specific SWMS and connected field records — in one platform built for Australian construction.

Sources