How to Set Up a Mine Site Dust Monitoring Programme

How to Set Up a Dust Monitoring Programme on a Mine Site: A Practical Guide to TEOM, BAM and Real-Time Monitoring

Dust monitoring on a mine site serves two distinct but interconnected purposes. The first is compliance: demonstrating to regulators, the community and the workforce that dust levels are within prescribed limits. The second is operational: providing the real-time data that enables proactive dust management before limits are breached. Most mine sites invest in the first and neglect the second — producing quarterly compliance reports that confirm what happened last month while providing no information that helps manage what is happening right now.

An effective dust monitoring programme integrates both purposes into a single system. Personal exposure monitoring protects workers by verifying that occupational health controls are effective. Ambient boundary monitoring protects the community and the environment by verifying that site emissions do not exceed air quality criteria at the property boundary. Real-time operational monitoring protects the operation by providing immediate feedback that triggers proactive dust management before compliance limits are approached.

This article covers how to design, equip and implement a monitoring programme that serves all three purposes — the instruments, the placement principles, the data management framework, and the integration with dust suppression systems that closes the loop between what you measure and what you do about it.

The Three Tiers of Mine Site Dust Monitoring

Mine site dust monitoring: three-tier framework

Most mine sites have Tier 1 (personal monitoring) because regulators require it. Many have Tier 2 (boundary monitoring) because their environmental authority mandates it. Few have Tier 3 (operational monitoring) deployed effectively — yet it is Tier 3 that enables the proactive dust management that prevents Tier 1 and Tier 2 exceedances from occurring.

Tier 1: Personal Exposure Monitoring — Protecting the Worker

Personal exposure monitoring measures the concentration of respirable dust and respirable crystalline silica (RCS) in the breathing zone of individual workers during their shift. It is the direct measurement of what the worker inhales and is the basis for assessing compliance with the workplace exposure standard (currently 0.05 mg/m³ for RCS; 1.5 mg/m³ for respirable coal dust).

Equipment. A personal sampling pump draws air through a cyclone pre-selector (which separates particles by aerodynamic diameter, passing only the respirable fraction below 4 μm) onto a pre-weighed filter. The pump is worn by the worker, with the cyclone positioned in the breathing zone (typically clipped to the collar or lapel). The pump runs for the duration of the shift at a calibrated flow rate. After sampling, the filter is sent to a NATA-accredited laboratory for gravimetric analysis (total respirable dust mass) and, where required, X-ray diffraction or infrared spectroscopy analysis for crystalline silica content.

Similar Exposure Groups. RS14 and QGL02 require monitoring to be structured around Similar Exposure Groups (SEGs) — groups of workers who are expected to have similar exposure profiles because they perform similar tasks in similar locations. Typical mine site SEGs include haul truck operators, drill operators, crusher/screen operators, loader operators, blast crew, workshop personnel and office workers. The SEG structure must be established by a competent person (certified occupational hygienist or equivalent) and reviewed periodically.

Frequency and reporting. RS14 requires quarterly monitoring and reporting to the Chief Inspector of Mines. QGL02 requires periodic monitoring at a frequency determined by the risk assessment. The NSW WHS(MPS) Regulation requires monitoring sufficient to characterise exposure for each SEG. Results must be compared to the WES, communicated to workers, and retained for 30–40 years depending on jurisdiction.

Exceedance response. If a personal monitoring result exceeds the WES, the site must investigate the cause, implement corrective actions, resample within the timeframe specified by the recognised standard, and report the exceedance to the regulator. Repeated exceedances in the same SEG trigger escalating regulatory scrutiny and potential enforcement action.

Tier 2: Ambient Boundary Monitoring — Protecting the Community

Ambient boundary monitoring measures the concentration of particulate matter in the air at the site boundary, where the mine’s emissions interact with the surrounding environment and community. Results are assessed against the National Environment Protection (Ambient Air Quality) Measure (NEPM AAQ) criteria and any site-specific conditions in the environmental authority.

NEPM criteria. The current national standards for particulate matter are 50 μg/m³ for PM10 (24-hour average, with no more than 5 exceedance days per year as the goal) and 25 μg/m³ for PM2.5 (24-hour average). State environmental authorities may prescribe tighter site-specific limits based on the proximity and sensitivity of receptors.

Instruments — TEOM. The Tapered Element Oscillating Microbalance (TEOM) is one of the most widely used real-time particulate monitors for mine site boundary monitoring. It works by collecting particles on a filter mounted on an oscillating tapered element. As mass accumulates on the filter, the oscillation frequency decreases. The frequency change is proportional to the collected mass, providing a continuous real-time measurement of PM10 or PM2.5 concentration reported as μg/m³. TEOMs offer high precision (± 0.5 μg/m³), continuous real-time data at 10-minute to 1-hour intervals, and do not require a radiation source. They do require mains or solar power, climate-controlled housing, and periodic filter and maintenance service.

Instruments — BAM. The Beta Attenuation Monitor (BAM) measures particulate mass by drawing air through a filter tape and measuring the attenuation of beta radiation passing through the collected sample. Greater mass on the filter causes greater attenuation. BAMs provide continuous, hourly PM2.5 or PM10 measurements and are widely used as the reference or near-reference method by state EPA networks across Australia. AS/NZS 3580.9.13 provides the standard method for TEOM-FDMS and BAM measurements. BAMs contain a low-activity radioactive source, which requires licensing in some jurisdictions.

Instruments — HVAS. High Volume Air Samplers (HVAS) are the reference gravimetric method for PM10 and TSP measurement. They draw a known volume of air through a pre-weighed filter over a 24-hour period. The filter is then weighed to determine total mass collected. HVAS provide the most accurate single measurement but only deliver a 24-hour average — they cannot identify when during the day the dust was elevated, which limits their operational utility for proactive management.

Instruments — E-Sampler and portable monitors. Real-time optical monitors such as the E-Sampler and DustTrak provide continuous PM10 and PM2.5 data using light-scattering technology. They are less accurate than TEOM and BAM instruments but are significantly less expensive, faster to deploy and suitable for supplementary monitoring locations where reference-grade precision is not required. EPA Victoria uses DustTraks as substitutes when infrastructure is not available to support TEOMs, and regularly compares measurements between DustTraks and TEOMs for quality control.

Station Placement: The Most Important Decision in the Programme

The placement of boundary monitoring stations determines what the data represents. A station in the wrong location can show compliance when a receptor is experiencing elevated dust, or show exceedances caused by sources outside the mine’s control.

Downwind of the site, closest to sensitive receptors. The primary boundary station must be located between the mine’s dominant dust sources and the nearest sensitive receptor (residence, school, hospital, community facility). Wind rose analysis from the site’s automatic weather station (AWS) identifies the prevailing wind directions. Stations should be placed on the boundary in the direction that receptors are most frequently downwind of the operation. For most Australian mine sites, this means stations on the western or south-western boundary (receptors downwind of the prevailing easterly or north-easterly winds). Multiple stations may be required to cover seasonal wind direction variation.

Upwind background station. A background or upwind station measures the ambient particulate concentration that exists independently of the mine’s emissions. This is essential for distinguishing mine-generated dust from other sources (bushfire smoke, agricultural dust, regional background). The background station should be located upwind of the site’s operations under the prevailing wind conditions and at a distance sufficient to be unaffected by the mine’s emissions.

AS/NZS 3580.1.1 siting requirements. The Australian Standard for siting air monitoring equipment specifies requirements for clearance from buildings, trees and other obstructions, inlet height (typically 2–5 metres above ground), distance from roads, and representativeness of the monitoring location. Compliance with this standard is expected by regulators and should be documented in the monitoring programme design report.

Dispersion modelling. For new mine developments or expansions, atmospheric dispersion modelling (using tools such as AERMOD or CALPUFF with meteorological data from CALMET) predicts the spatial distribution of dust concentrations across the site and surroundings under various operational and meteorological scenarios. The modelling results inform station placement by identifying the locations where the highest concentrations are predicted at the boundary. This ensures that the monitoring programme is designed to detect the worst-case impact, not the average.

Tier 3: Real-Time Operational Monitoring — Closing the Loop

Tier 3 monitoring is where data becomes action. Real-time dust sensors placed at key operational locations — haul road junctions, crusher discharge, stockpile perimeters, pit rims and other significant sources — provide continuous feedback on dust conditions across the site. This data feeds directly into the TARP framework, triggering proactive management responses before boundary monitors or personal exposure results indicate a problem.

Sensor networks. Modern IoT-enabled dust sensors (such as the Aeroqual Dust Sentry, Oizom Polludrone, or equivalent PM10/TSP monitors) can be deployed in networks of 5–20+ units across a mine site, communicating wirelessly to a central dashboard. Each sensor reports PM10 or TSP concentrations at 1–15 minute intervals, providing a spatial map of dust conditions across the entire operation in near-real-time.

TARP integration. The TARP framework defines trigger levels and response actions at each level. A well-designed Tier 3 system integrates sensor data with TARP thresholds to generate automatic alerts when dust levels at a specific location approach the trigger. For example: a sensor at the haul road intersection shows PM10 rising above the Level 1 TARP threshold — the operations centre is alerted and dispatches the water truck to that section. The suppression response is targeted, timely and evidence-based rather than operating on a fixed schedule regardless of conditions.

Suppression feedback. Tier 3 monitoring provides the feedback loop that verifies whether dust suppression is working. When GRT: Haul-Loc is applied via SMART Dosing Units, the sensor data before and after application quantifies the suppression effectiveness in real time. If the data shows that dust levels drop by 80–90% after a polymer-treated water pass and remain low for hours (compared to minutes with plain water), the site has continuous, objective evidence that the engineering control is performing as specified. This data supports the dust management plan, TARP reporting and regulatory audits.

Integration with SMART Dosing telemetry. GRT’s SMART Dosing Units report dosing events, water consumption and product usage in real time. When integrated with Tier 3 dust sensor data, the site’s operations centre has a single dashboard showing dust levels at every monitored location, water truck activity, dosing events and the correlation between suppression application and dust level response. This is the closed-loop system that transforms dust management from a reactive, schedule-based activity into a data-driven, condition-responsive programme.

Data Management: From Measurement to Decision

The monitoring programme generates data across three tiers, multiple instruments and continuous timeframes. Without a structured data management framework, the data is overwhelming and underutilised.

Data validation and QA/QC. All monitoring data must be validated before use. For TEOM and BAM instruments, this includes regular calibration checks, flow rate verification, filter condition monitoring and comparison with co-located reference instruments where available. EPA Victoria regularly compares DustTrak measurements against TEOMs for quality control. The NSW Air Quality network uses AS/NZS 3580.9.13 as the standard method. Invalid or suspect data must be flagged and excluded from compliance assessments.

Reporting intervals. Personal exposure results are reported quarterly (RS14) or per the site’s monitoring schedule. Boundary monitoring results are typically reported monthly or quarterly against NEPM criteria. Real-time operational data is available continuously and reported at intervals defined by the TARP (typically shift summaries, daily exception reports and monthly trend reports).

Trend analysis. The value of monitoring data increases with time. Trend analysis across seasons, production rates, wind conditions and suppression treatments reveals patterns that inform the dust management plan’s annual review. A site that can demonstrate a three-year trend of improving dust performance — supported by the data — builds regulatory credibility and community confidence.

Common Monitoring Programme Mistakes

Wrong instrument for the purpose. Using a DustTrak for regulatory compliance reporting when the environmental authority requires an AS/NZS 3580-compliant method (TEOM, BAM or HVAS). Conversely, using an expensive TEOM for internal operational monitoring when a lower-cost sensor would provide adequate data for TARP triggering.

Stations in the wrong location. Boundary stations placed for convenience (near power, near the office) rather than at the boundary closest to the most-impacted receptor under prevailing wind conditions. A station that consistently shows low readings may simply be in the wrong place.

No upwind background station. Without a background station, every dust reading at the boundary is assumed to be from the mine. Bushfire smoke, agricultural dust, regional dust events and other sources can cause exceedances that are not attributable to the operation — but without background data, this cannot be demonstrated.

No connection to action. The most expensive monitoring programme is worthless if the data does not trigger a management response. If boundary monitoring shows elevated PM10 at 2 pm but the water truck does not increase its application rate until the next scheduled shift, the monitoring has documented a problem without preventing it. Tier 3 operational sensors linked to TARP triggers close this gap.

Insufficient maintenance. TEOMs and BAMs require regular maintenance — filter changes, flow calibrations, inlet cleaning, climate control system servicing. A TEOM that has not been serviced for six months may be producing unreliable data. Maintenance schedules must be built into the monitoring programme budget and staffing plan.

Monitoring That Drives Action, Not Just Reports

The purpose of a dust monitoring programme is not to produce data. It is to produce outcomes: workers breathing clean air, communities free from dust impact, regulators confident that the operation is well managed, and an operations team that has the real-time information to respond before problems occur.

An effective programme integrates all three tiers: personal monitoring that verifies worker protection, boundary monitoring that demonstrates community and environmental compliance, and real-time operational monitoring that enables proactive management. The instruments — TEOMs, BAMs, gravimetric samplers, real-time sensors — are commercially available and well understood. The placement principles are defined by AS/NZS 3580 and informed by dispersion modelling. The data management framework connects measurement to the TARP framework and to the dust suppression systems that deliver the response.

For occupational hygienists, environmental managers and compliance officers designing or upgrading a mine site dust monitoring programme, the objective is clear: build a system where every data point connects to a decision. When the sensor at the haul road junction shows PM10 rising, the SMART Dosing Unit at the standpipe has already ensured the water truck’s next pass will deliver polymer-activated water that suppresses that dust for hours, not minutes. That is monitoring that works — not because it measures the dust, but because it stops it.

Sources and References

NSW Resources Regulator: Technical Reference Guide: Monitoring and Control of Worker Exposure to Airborne Dust (May 2025)

RSHQ: Recognised Standard 14 — Monitoring Respirable Dust in Coal Mines

Queensland Resources: QGL02 — Guideline for Management of Respirable Dust in Mineral Mines and Quarries

EPA Victoria: How We Measure Air Pollution — TEOM, BAM, DustTrak, Partisol methods and QA/QC

NSW Air Quality: How We Monitor Air Pollution — TEOM-FDMS, DustTrak DRX, AS/NZS 3580.9.13

Environmental Site Services: BAM & TEOM Real-Time Dust Monitors — operational principles, NEPM criteria, applications

Aeroqual: Monitoring Mine, Construction and Quarry Dust in Real-Time — TEOM vs BAM comparison, sensor technology

WA EPA / Worsley Alumina: Dust Management Plan — Bauxite Mining and Transport — TEOM network, AS/NZS 3580.1.1 compliance, NEPM 6th highest methodology

Midwest Ports: Annual Environmental Report 2025 — TEOM monitoring at 10-minute intervals, HVAS metals speciation

NCBI: Integrated Smart Dust Monitoring and Prediction System for Surface Mine Sites Using IoT and ML (2024)

GRT: Dust Monitoring and Compliance Reporting

GRT: Dust Suppression Solutions — product range

GRT: GRT: Haul-Loc

GRT: SMART Dosing Units — telemetry and automated dosing