WEL Substance Profile

Coal Dust — Workplace Exposure Limit Change

CAS: Not applicable (natural material) | Notation: Respirable fraction

Current WES

mg/m³

New WEL (Dec 2026)

1.5

mg/m³

Change

-50%

reduction

Health Effects

Coal dust inhalation causes coal workers' pneumoconiosis, commonly known as black lung disease, a progressive and irreversible fibrotic lung disease. Australia experienced a resurgence of black lung disease from 2015 onwards, with cases identified in Queensland coal mines after decades during which the disease was believed to have been eliminated. The resurgence demonstrated that exposure controls had been inadequate despite compliance with the previous exposure standard. Progressive massive fibrosis, the most severe form of coal workers' pneumoconiosis, causes severe respiratory disability and premature death. Mixed dust pneumoconiosis occurs when coal dust exposure is combined with silica exposure, which is common in coal mining where cutting through sandstone and shale releases respirable crystalline silica. Chronic bronchitis and emphysema are also associated with chronic coal dust exposure, with dose-response relationships demonstrated at exposure levels below the current WES.

Where Exposure Occurs

Underground coal mining — longwall and continuous miner operationsOpen cut coal mining — drilling, blasting, and haulingCoal handling and preparation plantsCoal-fired power station fuel handlingCoal loading and ship loading terminalsCoal laboratory sample preparation and analysis

What to Do Now

01Conduct comprehensive respirable dust monitoring across all coal handling and mining operations. Personal sampling using gravimetric cyclone samplers must cover a full production shift to capture representative time-weighted average exposures. Monitor all designated occupation groups including continuous miner operators, longwall operators, shuttle car operators, and coal handling plant workers.

02Upgrade dust suppression systems on continuous miners, longwall shearers, and other cutting equipment. Water spray systems must be maintained at design pressures and flow rates, with nozzles inspected and replaced at defined intervals. Shearer drum water sprays, face sprays, and scrubber systems on continuous miners are critical controls that must operate at optimal efficiency to achieve the lower limit.

03Review and upgrade ventilation systems in underground operations. Increased airflow velocity at the working face dilutes dust concentrations but must be balanced against the risk of entraining settled dust. Auxiliary ventilation, scrubber fans, and flooded-bed dust scrubbers provide supplementary dust control at the point of generation. Ventilation design must account for the 50 per cent reduction in the permissible limit.

04Implement a coal mine dust health surveillance program compliant with the Coal Mining Safety and Health Act requirements. The program must include baseline and periodic chest imaging, lung function testing, and respiratory symptom questionnaires. Given the resurgence of black lung disease in Australia, health surveillance intervals should not exceed two years for underground workers and three years for surface workers.

05Maintain and calibrate real-time dust monitors including continuous personal dust monitors and fixed-point dust monitoring systems. Real-time monitoring provides immediate feedback on dust conditions and enables proactive intervention when dust levels are trending upward. Data from real-time monitors should be reviewed daily by the site senior executive and ventilation officers to identify areas requiring additional controls.

Monitoring Method

Personal air sampling using a calibrated pump at 2.2 L/min with a Higgins-Dewell respirable cyclone and pre-weighed PVC filter. Gravimetric analysis for total respirable dust. Where silica co-exposure is suspected, X-ray diffraction analysis of the same filter for respirable crystalline silica content is required. Real-time personal dust monitors such as the PDM3700 provide continuous exposure data for immediate feedback.

Prevent Black Lung with Rigorous Dust Control

EHS Atlas tracks coal dust monitoring data against the incoming 1.5 mg/m³ WEL, manages health surveillance records, and documents ventilation system performance for mining operations.