WES to WEL: What the Change Means for Businesses

Businesses across NSW should now be preparing for the transition from Workplace Exposure Standards (WES) to Workplace Exposure Limits (WEL) for airborne contaminants. While the change may sound administrative, it has practical implications for how employers review exposure risks, assess existing controls, and determine whether further air monitoring is needed.

For many businesses, this will be especially relevant where workers may be exposed to contaminants such as welding fume, diesel emissions, and respirable crystalline silica. If your organisation relies on historical monitoring data or has not recently reviewed airborne exposure risks, now is a sensible time to take a closer look at whether your current approach remains fit for purpose.

What is changing from WES to WEL?

NSW businesses should be aware that the move from Workplace Exposure Standards (WES) to Workplace Exposure Limits (WEL) is more than a simple change in terminology. The updated framework is intended to make it clearer that these values are limits that must not be exceeded, while also aligning Australian terminology more closely with international practice.

The transition also reflects a broader review of airborne contaminant listings. Depending on the substance, changes may include revised exposure limit values, changes to notations, updated classifications, and amendments to how some contaminants are listed. For that reason, businesses should not assume that compliance under the current WES framework will automatically mean their existing monitoring, controls, or risk assessments remain sufficient under the WEL framework.

When do NSW businesses need to comply with WELs?

Businesses in NSW must continue to comply with the current Workplace Exposure Standards (WES) until 30 November 2026. From 1 December 2026, businesses must comply with the Workplace Exposure Limits (WEL) framework for airborne contaminants.

This transition period is important because it gives employers time to review their current exposure risks, monitoring data, and control measures before the new framework applies. For businesses with potential exposure to welding fume, respirable crystalline silica, diesel emissions, or other airborne contaminants, waiting until the change takes effect may leave too little time to identify gaps and respond properly.

Why the WES to WEL change matters for businesses

For many NSW businesses, the transition from WES to WEL is not simply a regulatory update to note and move on from. It is a prompt to review whether current risk assessments, exposure monitoring data, and control measures still reflect the actual conditions at the workplace.

Many organisations rely on historical air monitoring results, legacy risk assessments, or controls that were put in place some time ago. If processes have changed, production has increased, materials have changed, ventilation has been altered, or exposure profiles are different from when previous assessments were undertaken, those older assumptions may no longer be reliable.

This is particularly important where workers may be exposed to welding fume, respirable crystalline silica, diesel emissions, or other airborne contaminants with significant health risks. In practical terms, businesses should be asking whether their current information is still representative, whether their controls are performing as intended, and whether further personal exposure monitoring is needed to properly understand risk.

Which businesses are most likely to be affected?

This change is most relevant to businesses where workers may be exposed to airborne contaminants as part of normal operations.

That may include:

welding and fabrication workshops
construction and demolition businesses
manufacturing and processing facilities
quarries, mining support, and heavy industry
transport, plant, and diesel-powered workshops
businesses carrying out silica-generating tasks

If your workplace involves dusts, fumes, smoke, aerosols, or diesel exhaust, this change is worth reviewing closely.

Welding fume:
NSW businesses should review exposure monitoring

Welding fume remains a key concern for many NSW businesses because exposure can vary significantly depending on the process, materials, consumables, and ventilation conditions at the site.

For businesses carrying out regular welding, cutting, or related hot work, it is worth reviewing whether existing controls and any previous monitoring still reflect current conditions. Where there is uncertainty about worker exposure, personal exposure monitoring can help determine whether risks are being adequately managed and whether further control measures are needed.

Respirable crystalline silica: when a review of monitoring and controls may be needed

For businesses carrying out cutting, grinding, drilling, crushing, or other silica-generating tasks, respirable crystalline silica remains a major exposure risk.

If current controls have not been reviewed recently, or if there is uncertainty about actual worker exposure, air monitoring may be needed to determine whether risks are being adequately managed. This is especially important where work conditions, materials, or methods have changed since previous assessments were completed.

Diesel emissions:
a commonly overlooked exposure risk

Diesel emissions can be an overlooked issue in workplaces that use diesel-powered plant, vehicles, or equipment, particularly in enclosed, semi-enclosed, or poorly ventilated areas.

For businesses operating workshops, depots, construction sites, tunnels, or heavy industrial environments, it is worth reviewing whether diesel exhaust exposure has been properly considered. If there is uncertainty about worker exposure, a targeted assessment can help determine whether current controls and work practices are adequate.

Does your business need new exposure monitoring?

Your business may need updated exposure monitoring if:

previous monitoring is old or limited
processes, materials, or production levels have changed
ventilation or other controls have been modified
workers are carrying out tasks involving welding fume, silica dust, or diesel exhaust
you are unsure whether current exposure data is still representative

If there is uncertainty, a review can help determine whether further personal exposure monitoring is warranted.

How to prepare for the transition from WES to WEL

Review where airborne contaminant exposures may occur and whether current controls and monitoring still reflect actual site conditions.

This means checking:

what contaminants may be generated
which tasks or areas present the highest exposure risk
whether previous monitoring is still representative
whether controls need to be reviewed or strengthened
whether further exposure monitoring is needed

Doing this early can make the transition easier and help avoid relying on outdated assumptions.

How SafeSphere Consulting can help

SafeSphere Consulting helps businesses assess airborne contaminant risks and understand whether current controls and exposure monitoring remain fit for purpose.

This may include occupational hygiene assessments, personal exposure monitoring, and practical advice for contaminants such as welding fume, respirable crystalline silica, and diesel emissions. Where required, findings can be used to support risk reviews, compliance planning, and decisions about further control measures.