Respirable crystalline silica (RCS) exposure doesn’t occur evenly across the Australian workforce. The risk of developing silicosis—an incurable, progressive fibrotic lung disease—depends heavily on your industry, the specific tasks you perform, and the geological sources of silica in your workplace. Some industries face exposure concentrations routinely exceeding the Workplace Exposure Standard (WES) of 0.05 mg/m³, while others may never encounter RCS unless controls fail or work practices deteriorate.
Understanding which industries carry the highest silica risk is critical for employers, safety officers, and workers themselves. This article maps the 12 sectors where RCS exposure is most prevalent in Australia, explains why each is high-risk, identifies the highest-exposure tasks, and outlines the monitoring approach each industry should adopt.
Construction and Building Trades
Construction remains Australia’s largest RCS exposure sector. Concrete cutting, grinding, and drilling generate respirable dust at concentrations often exceeding 1–3 times the WES when dry methods are used. Bricklaying and block laying in older buildings (pre-1980s) can mobilise legacy asbestos-containing materials alongside silica dust. Tiling installation—particularly tile cutting—produces fine silica aerosol. Plasterboard cutting, especially with power tools and no dust extraction, exposes workers to both gypsum and silica filler materials.
The highest-risk tasks are concrete saw cutting (0.1–0.5 mg/m³), angle grinding of concrete (0.2–1.2 mg/m³), and shotcrete finishing in high-volume commercial projects. The typical monitoring approach should combine personal air sampling (ISO 12103-1 A2 test dust reference material, or gravimetric collection onto cassettes analysed by FTIR) on 3–5 workers per major task, conducted quarterly or after control changes. For construction firms managing multiple sites, real-time dust monitors (optical particle counters calibrated to RCS mass concentration) on-site can identify where WES exceedances are occurring and trigger immediate control adjustments.
Many construction firms overlook silica exposure on apparent “low-risk” tasks: concrete drilling for anchor holes, cutting expansion joints, and angle grinding of mortar joints all generate respirable dust. The engineered stone ban (effective July 2024 in Victoria, rolling nationally) has removed one major silica source, but natural stone cladding, granite, sandstone, and slate work continue. Recommendation: Monthly personal monitoring during peak dust-generating activities; annual health monitoring (chest X-ray, spirometry) for workers with >5 years’ cumulative exposure.
Mining — Hard Rock Metalliferous
Hard rock mining (gold, copper, zinc, nickel) in Australia involves drilling, blasting, and crushing of highly silica-rich ore bodies. Bore hole drilling in particularly silica-rich ore can generate exposure concentrations of 0.1–0.8 mg/m³ even with local exhaust ventilation in place. Open-pit mining produces airborne dust during blasting and ore handling; underground operations (including narrow stopes and heading development) create confined, high-concentration environments where RCS can rapidly accumulate.
Ore handling and crushing at surface plants expose workers to respirable dust at 0.2–2 mg/m³, depending on ore type, humidity, and dust suppression. Fettling and processing of final concentrate materials can also contribute RCS exposure. Hard rock mining faces particularly high statutory scrutiny: the Queensland Mines and Quarries Safety and Health Act 1999 explicitly regulates RCS exposure, and equivalent frameworks apply in NSW, WA, and South Australia.
The monitoring approach must include quarterly personal air sampling on drill operators, blast crews, and ore handling personnel. Most large mining operations employ a NATA-accredited hygienist on-site or on contract to conduct annual sampling cycles covering all high-exposure occupations. Real-time monitoring on drilling equipment can identify when WES thresholds are being approached, allowing operators to call for additional ventilation or reposition themselves. Recommendation: Quarterly personal monitoring; annual health screening (baseline and annual X-rays, spirometry with diffusing capacity assessment) for workers in hard rock mines with cumulative RCS exposure.
Mining — Coal
Coal mining in Queensland, NSW, and Tasmania exposes workers to a different silica hazard: silica is present as a co-contaminant in coal seams, particularly in thinner seams where coal-bearing strata overlie silica-rich roof and floor rocks. Workers are exposed during coal seam development, longwall mining (cutting and face advance), and roof support installation. Exposure is typically lower than hard rock mining (0.02–0.15 mg/m³) but occurs chronically over long careers.
Queensland’s Recognised Standard 14 specifically regulates coal mining silica exposure separately from the general WES, recognising the unique dust profile in coal operations. The distinction is important: coal dust itself is not crystalline silica (it is classified as a nuisance dust with a 3.5 mg/m³ WES), but the respirable silica fraction embedded in coal seams falls under RCS regulation.
Coal mining operators must conduct baseline and periodic personal air sampling specifically targeting the RCS fraction (not total coal dust). FTIR analysis must differentiate respirable quartz from coal matrix. Recommendation: Baseline monitoring of all coal seam workers; periodic sampling (12-monthly) of workers in high-exposure headings and stope work; health monitoring aligned with QLD coal industry guidelines (baseline and annual chest X-rays for workers with >5 years’ exposure).
Quarrying
Rock quarrying operations expose workers to respirable silica during drilling, blasting, primary crushing, and secondary screening. The silica content of quarried material varies by geology: granite and basaltic quarries have high quartz content (20–40%), while limestone and shale quarries may have lower free silica percentages. Crushing and screening operations generate the largest volume of respirable dust, with concentrations frequently in the 0.1–0.5 mg/m³ range.
Quarry workers are often exposed for extended periods during a single shift: a crushing plant operator may spend 6–8 hours in the dust envelope around crushers, screens, and conveyor transfer points. Cabs with sealed, positively-pressurised air supply, combined with external dust suppression (water sprays, foam suppressants), can reduce exposure. However, many smaller quarries lack engineering controls, placing workers at high RCS risk.
The monitoring approach should include quarterly personal air sampling on key job roles: drilling and blast teams, crusher operators, screen operators, and truck drivers. Real-time dust monitors deployed near crushing and screening equipment help identify when dust suppression systems are failing. Recommendation: Quarterly personal monitoring; engineering control assessment (on-site walk-through) every 12 months to verify dust suppression effectiveness; annual health monitoring for workers with >3 years’ quarrying exposure.
Tunnelling and Underground Civil Engineering
Tunnelling work—tunnel boring machine (TBM) operations, drill and blast development, shotcrete application, and mucking (material removal)—occurs in highly confined environments where RCS concentration can rapidly exceed the WES. Excavated material in sandstone, granite, and metamorphic rock tunnels contains significant free silica. A single blast event in a 5-metre tunnel section can produce RCS concentrations of 5–20 mg/m³ in the working area if ventilation is inadequate.
TBM mucking operations involve loading silica-laden muck into trucks in limited-ventilation environments; shotcrete application (spraying refractory concrete onto tunnel walls) exposes workers to fine silica aerosol. Heading development by drill and blast generates massive dust clouds: workers must wear respiratory protection during blasting and for 30–60 minutes afterward until ventilation clears the dust. Even with primary extraction ventilation on drill rigs, secondary dust generation during mucking often exceeds engineering control capacity.
Tunnelling is one of Australia’s highest-risk RCS sectors. The 2022–2024 outbreak of accelerated silicosis diagnoses included several tunnel workers exposed during major urban rail and motorway projects. Recommendation: Personal air sampling on every tunnelling project, conducted monthly during active heading development and every 3 months during TBM mucking phases. Samples should be collected on workers’ breathing zones during mucking and heading work, not just during quiescent periods. Real-time dust monitors should be deployed in tunnel headings and mucking areas to identify WES exceedances in real time. Health monitoring (baseline and 12-monthly) is essential for all tunnelling workers with >1 year cumulative exposure, given the accelerated silicosis risk in this sector.
Demolition and Remediation
Building demolition, interior strip-out, and asbestos removal expose workers to RCS during concrete breaking, brick crushing, tile removal, and grinding of concrete slabs. Demolition contractors often work in buildings where asbestos-containing materials coexist with silica-bearing concrete and masonry. Concrete breaking by pneumatic breaker, wall saw cutting, and concrete grinder use generate respirable dust at 0.2–1.5 mg/m³.
Remediation work—removal of old tiles, render, and coatings from heritage buildings—frequently mobilises legacy materials (asbestos, lead paint) alongside silica dust. Controlled demolition (crushing of concrete on-site in enclosed structures) produces extremely high dust concentrations; proper controls (water suppression, enclosure, HEPA-filtered negative pressure) are essential.
Demolition is often a short-term, transient work environment: a crew may spend 2–3 weeks on a single site and move to another project. This makes ongoing monitoring difficult but essential. Recommendation: Personal air sampling on every major demolition project, with baseline samples collected in the first week. If WES is exceeded, engineering controls must be implemented immediately, and follow-up sampling conducted 1–2 weeks later to verify effectiveness. Small demolition contractors (residential renovation demolition, minor strip-outs) often have no monitoring program; this is a major compliance gap.
Stone Fabrication and Masonry
Although engineered stone fabrication (granite-composite benchtops) is now banned in Australia, natural stone fabrication—granite, marble, limestone, sandstone cutting and finishing—continues as a significant RCS exposure source. Granite and sandstone cutting by water-jet, diamond blade wet-cutting, or hand chiselling generate respirable dust when dry methods are used. Polishing and finishing operations produce fine silica aerosol.
Engineered stone (before the ban) caused accelerated silicosis in workers in their 30s and 40s; exposure concentrations in fabrication shops were often 0.2–2 mg/m³ even with dust collection systems. Natural stone work typically involves lower exposure concentrations (0.05–0.3 mg/m³) due to lower production volumes and use of wet-cutting methods, but chronic exposure over 20+ years still poses significant silicosis risk.
Masonry work—stone cutting, laying, and pointing—exposes workers to RCS from sandstone, granite, and slate. Hand-held angle grinders on stone generate particularly high dust. Recommendation: Personal air sampling on natural stone fabrication workers, conducted quarterly. Masonry workers engaged in cutting work should be sampled semi-annually. Natural stone fabricators should validate that wet-cutting systems are functioning correctly (spray systems operational, catch trays draining properly); any switch to dry-cutting methods must trigger immediate high-frequency monitoring.
Foundries and Metal Casting
Metal casting foundries use silica-rich casting sand (silica content 90–99%) in moulds and cores. Fettling operations (grinding excess metal from castings) expose workers to silica-laden aerosol. Sand handling, moulding, and shake-out (removal of casting from spent mould) all generate respirable dust. Refractory brick and mortar used in furnace linings contain significant crystalline silica; maintenance workers replacing refractory material are at particular risk.
Exposure in foundries typically ranges from 0.05–0.5 mg/m³ depending on sand type, moisture content, and dust suppression. Ferrous foundries (iron and steel casting) are particularly common in Australia; non-ferrous foundries (aluminium, bronze) may use lower-silica sands but still pose RCS risk. Recommendation: Personal air sampling on sand handlers, moulders, shake-out workers, and fettlers—conducted quarterly. Refractory maintenance teams should be sampled before and after furnace maintenance campaigns.
Ceramics, Pottery, and Glass Manufacturing
Ceramic and pottery manufacturing exposes workers to crystalline silica in raw clay bodies (which typically contain 20–40% quartz), glaze materials, and firing by-products. Glass manufacturing involves silica as the primary raw material; silica exposure occurs during raw material handling, batch preparation, and cleaning of furnaces and equipment.
Pottery and ceramic workshops—both industrial and artisan—often have minimal dust control: wheels, kilns, and hand-thrown pottery work in open air without local exhaust ventilation. Exposure concentrations can range from 0.01–0.3 mg/m³ depending on clay type and ventilation. Hand-sanding of greenware (unfired ceramics) generates particularly fine dust.
Glass manufacturing exposes workers to silica dust during raw material handling (silica sand) and during crushing of cullet (recycled glass). Furnace maintenance in glass plants involves high silica exposure. Recommendation: Personal air sampling on pottery and ceramic workers engaged in dust-generating tasks (throwing, sanding, trimming), conducted 6-monthly. Glass manufacturing operations should conduct quarterly sampling on raw material handlers and furnace maintenance workers.
Agriculture and Rural Industries
Agricultural work—particularly in regions with silica-rich soils—exposes workers to respirable silica dust during soil cultivation, ploughing, and harvesting operations. Grain handling in silos and grain-cleaning facilities mobilises silica dust (grain is grown in silica-rich soil and retains fine silica particles on the grain coat). Livestock facilities with compacted silica-rich earth floors generate airborne dust during animal movement and feeding.
This sector is frequently overlooked in silica risk discussions, yet rural workers face chronic, cumulative RCS exposure. A farm worker in a high-silica region spending 2,000 hours per year working soil faces significant lifetime silicosis risk. Exposure concentrations during ploughing and cultivation can range from 0.02–0.2 mg/m³, varying with soil type, moisture, and wind conditions.
Recommendation: Agricultural workers in known high-silica regions (parts of NSW inland, Queensland inland, SA outback) should be offered baseline health monitoring (chest X-ray, spirometry) and educated on respiratory protection use during high-dust tasks. Grain handlers should receive annual health monitoring if handling silica-rich grain regularly.
Plumbing and Fire Protection Installation
Plumbers and fire protection installers routinely cut concrete slabs, masonry walls, and concrete pipes to create penetrations for water and fire service pipework. Concrete saw cutting and angle grinding of concrete are common tasks. Fire protection systems installation in concrete buildings exposes workers to RCS dust during drilling and cutting of concrete and masonry.
This sector is rarely included in occupational hygiene discussions of silica exposure, but the work tasks are identical to those in construction: concrete cutting and grinding. Exposure concentrations during these tasks reach 0.1–1.5 mg/m³. A plumber performing concrete cutting 2–3 times per week over a 30-year career accumulates substantial RCS burden.
Recommendation: Plumbing and fire protection contractors should incorporate personal air sampling into their health and safety management systems, particularly for workers regularly engaged in concrete cutting. Baseline and periodic (24-monthly) health monitoring is appropriate for workers with >5 years’ cumulative exposure.
Kitchen and Bathroom Renovation and Installation
Kitchen and bathroom renovation—benchtop installation, tile cutting and fitting, splashback installation—exposes workers to RCS during tile cutting (angle grinder cutting of ceramic, porcelain, and stone tiles) and benchtop finishing (edge grinding and polishing of stone or engineered composite).
Although engineered stone benchtop installation is now banned, natural stone benchtop work continues and poses RCS risk. Tile cutting for kitchen and bathroom renovation is a very common task; it is performed by kitchen installers, tilers, and general tradespeople. Exposure concentrations during tile cutting can reach 0.2–0.8 mg/m³.
This sector is almost entirely unmonitored. Most small renovation businesses have no silica monitoring program. Kitchen and bathroom installers face cumulative RCS exposure from dozens of small projects over a career, yet are often classified as “low-risk” by safety managers unfamiliar with the specific tasks involved.
Recommendation: Kitchen and bathroom installation companies should conduct baseline personal air sampling on tile cutters and benchtop installers. If results exceed 0.05 mg/m³, engineering controls (wet-cutting systems, dust extraction on angle grinders) must be implemented and follow-up sampling conducted.
Comparative RCS Risk Table
| Industry | Primary High-Risk Task | Typical RCS Concentration | Relative Risk | Recommended Monitoring |
|---|---|---|---|---|
| Construction (concrete cutting) | Dry concrete saw cutting | 0.1–0.5 mg/m³ | HIGH | Quarterly personal sampling |
| Hard rock mining | Ore drilling, crushing | 0.1–0.8 mg/m³ | VERY HIGH | Quarterly personal sampling |
| Coal mining | Coal seam development | 0.02–0.15 mg/m³ | MEDIUM-HIGH | 12-monthly personal sampling |
| Quarrying | Crushing, screening | 0.1–0.5 mg/m³ | HIGH | Quarterly personal sampling |
| Tunnelling | Heading development, mucking | 5–20 mg/m³ (post-blast) | VERY HIGH | Monthly personal sampling + real-time |
| Demolition | Concrete breaking | 0.2–1.5 mg/m³ | HIGH | Per-project sampling |
| Stone fabrication | Granite cutting, polishing | 0.05–0.3 mg/m³ | MEDIUM-HIGH | Quarterly personal sampling |
| Foundries | Sand handling, fettling | 0.05–0.5 mg/m³ | MEDIUM | Quarterly personal sampling |
| Ceramics & glass | Clay handling, glass mfg. | 0.01–0.3 mg/m³ | MEDIUM | 6-monthly personal sampling |
| Agriculture | Soil cultivation, grain handling | 0.02–0.2 mg/m³ | MEDIUM | Baseline + annual health monitoring |
| Plumbing/fire protection | Concrete cutting | 0.1–1.5 mg/m³ | MEDIUM-HIGH | Periodic sampling (2-yearly) |
| Kitchen/bathroom renovation | Tile cutting | 0.2–0.8 mg/m³ | MEDIUM | Baseline sampling + engineering review |
Industries Often Overlooked
Agriculture, plumbing, kitchen installation, and renovation trades are the most frequently overlooked sectors in silica risk discussions. Safety managers often focus on “obvious” high-risk industries (mining, construction, quarrying) while missing chronic, cumulative exposure in trades that perform the same dust-generating tasks sporadically.
A plumber who cuts concrete 100 times per year for 30 years accumulates the same RCS burden as a construction worker cutting concrete 4–5 times per week. Yet the plumber is rarely captured in industry-wide monitoring programs or health surveillance schemes. Similarly, agricultural workers in high-silica regions face undocumented lifetime silica exposure.
The 2025 Safe Work Australia Model Code of Practice on Respirable Crystalline Silica emphasises that duty holders must identify all tasks involving silica, regardless of industry classification. A task-based approach (any task involving concrete cutting, grinding, stone work, soil handling, etc.) is more effective than an industry-based approach for capturing overlooked exposure.
Frequently Asked Questions
Q: Is my industry required to conduct RCS monitoring?
A: If your industry involves any task that generates or mobilises respirable dust (concrete cutting, grinding, drilling, stone work, mining, crushing, etc.), you have a legal duty under the Work Health and Safety Act to identify the hazard and assess the level of risk. If the risk assessment identifies potential WES exceedance, air monitoring is required. The Safe Work Australia Model Code of Practice (2025) provides a framework for this assessment.
Q: How do I know my industry’s silica risk?
A: Start with a hazard identification workshop with your team: identify every task performed that involves disturbing silica-containing materials (concrete, stone, soil, mined ore, casting sand, etc.). For each task, consider the frequency, duration, and whether dust suppression or extraction is used. If unsure, engage a NATA-accredited occupational hygienist to conduct a walk-through and preliminary exposure assessment. Most of the high-risk industries listed above should assume WES exceedance is possible until monitoring proves otherwise.
Q: Our industry is not listed above. Are we at risk?
A: If your workplace involves any of these tasks, RCS exposure is possible: concrete cutting/grinding/drilling, stone cutting/grinding/finishing, masonry work, mining or quarrying, foundry work, soil handling, or material crushing. Even if your industry is not traditionally associated with silica, if you perform these tasks, you must assess and likely monitor RCS exposure.
Q: Can we meet the WES with respiratory protection alone?
A: No. Respiratory protection is the last line of defence in the control hierarchy. Eliminating or substituting the silica source (e.g., using engineered materials instead of natural stone) is the first step; engineering controls (water suppression, dust extraction, local exhaust ventilation) are second; and only after these are in place and proven effective should respiratory protection be considered. Relying on respirators without engineering controls will not meet WHS Act obligations.
Q: What happens if our monitoring shows we’re exceeding the WES?
A: You must immediately implement engineering controls (improved dust suppression, extraction, ventilation, enclosure) and conduct follow-up sampling within 2–4 weeks. You must also review your health monitoring program and consider whether workers require immediate health assessment (chest X-ray, spirometry). Continued exceedance without action creates serious WHS compliance and civil liability exposure. If you are unsure how to interpret results or what controls to implement, engage an AIOH-certified hygienist immediately.
Q: Do we need to conduct health monitoring if air monitoring shows we’re below the WES?
A: This depends on exposure history and concentration. If air monitoring consistently shows results <0.03 mg/m³, health monitoring may not be required. If results are in the 0.03–0.05 mg/m³ range, annual or biennial chest X-ray and spirometry is prudent. If results exceed 0.05 mg/m³ (even briefly), annual health monitoring is recommended. Consult your occupational hygienist or occupational health physician to determine the appropriate health monitoring frequency for your workplace.
Q: How long do we need to keep silica monitoring records?
A: Monitoring records (air sampling reports, control implementation evidence, health monitoring results) must be retained for at least 30 years. This is specified in the Safe Work Australia Code of Practice and reflected in state-based WHS regulations. Given the long latency period of silicosis (10–40 years), a 30-year record retention allows affected workers to establish causation if they develop respiratory disease after employment ends.
Key Takeaway
Silica exposure risk varies enormously across industries and even within occupations. Rather than assuming your industry is “low-risk,” adopt a task-based approach: identify every task that disturbs silica-containing materials, measure the exposure, implement controls, and monitor health. Industries performing construction, mining, stone work, and crushing tasks face high, documented RCS risk. Agriculture, plumbing, and renovation trades—where the same tasks occur sporadically—are often overlooked, creating unmanaged cumulative exposure.
The December 2026 transition from the Workplace Exposure Standard to the Workplace Exposure Limit will increase the legal weight of these standards, making proactive monitoring and control even more critical. Your first step: audit your workplace tasks against this article, and if any high-risk tasks are identified, commission a formal exposure assessment.
Ready to Assess Your Silica Risk?
Find out if your industry requires a monitoring program. Contact our team for an obligation-free consultation. Anitech Group combines AIOH-certified occupational hygienists with NATA-accredited laboratory partnerships to deliver industry-specific silica monitoring and control solutions. Whether you’re in construction, mining, tunnelling, or an often-overlooked trade, we can help you understand your exposure profile and build a compliant monitoring program.
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IMAGE_REQUIREMENTS
- FEATURE (1200x630px): Collage of 8 high-risk industries: construction concrete cutting, hard rock mining drill, tunnelling headings, stone benchtop cutting, foundry sand handling, grain silo, plumber cutting concrete, tile cutter with angle grinder. Title overlay: “High-Risk Silica Industries in Australia.”
- BODY_1 (800x450px): Construction concrete cutting angle grinder generating dust cloud. Caption: “After Construction and Building Trades”
- BODY_2 (800x450px): Tunnelling mucking operation in confined heading, dust-laden environment. Caption: “After Tunnelling and Underground Civil Engineering”
