Australian businesses have fewer than three weeks to ensure they comply with new Workplace Exposure Limits (WEL) for airborne contaminants, which replace the existing Workplace Exposure Standards from 1 December 2026.

The new WEL list introduces health-based limits for 31 airborne contaminants added from Safe Work Australia’s Review of Workplace Exposure Standards, covering a broad range of substances present in manufacturing, mining, agriculture, and construction environments.

Businesses should check their Safety Data Sheets, review existing air monitoring programs, and confirm whether any substances they handle are covered by the new limits. Safe Work Australia recommends completing air monitoring before 1 December to establish baseline compliance.

Several jurisdiction-specific delays apply. NSW has deferred its phosphine WEL to 1 July 2028 and adopted a staged approach for diesel particulate matter. South Australia has delayed new limits for grain dust, flour dust and methyl bromide until no earlier than July 2028. All jurisdictions have agreed to defer the reduced benzene limit — which will drop to 0.2 ppm on an 8-hour time-weighted average — to 1 June 2027.

For substances without numeric limits under the new WEL framework, businesses will be required to manage exposure using a No Threshold Genotoxic Carcinogen (NTGC) approach, reducing risk as far as reasonably practicable.

The 1 December 2026 deadline is the most significant WHS compliance date for many Australian businesses this year. Organisations unsure of their obligations should consult their state or territory regulator or seek legal advice promptly.