Airborne dust generated by quarry operations consists of particles of many different sizes. Two of the most commonly monitored fractions are PM10 and PM2.5, both of which are used to assess air quality and support effective dust management.
Although they are often mentioned together, PM10 and PM2.5 behave differently in the atmosphere and can present different environmental and operational challenges.
Understanding the difference between these particle sizes helps quarry operators choose appropriate monitoring systems, improve environmental management and make informed decisions about dust control strategies.
PM stands for Particulate Matter, referring to tiny solid or liquid particles suspended in the air.
The number refers to the particle’s diameter, measured in micrometres (µm).
Because PM2.5 particles are much smaller, they remain airborne for longer and can travel further than larger dust particles.
| Feature | PM10 | PM2.5 |
|---|---|---|
| Particle size | Up to 10 µm | Up to 2.5 µm |
| Visibility | Often visible as dust | Usually invisible |
| Settles quickly | Yes | No |
| Travels long distances | Less | More |
| Common quarry sources | Crushing, screening, haul roads | Fine crushing, vehicle emissions, processing activities |
Both measurements provide valuable information, and many monitoring systems measure them simultaneously.
PM10 is the fraction most commonly associated with visible dust emissions.
It is typically generated by:
Monitoring PM10 helps operators identify where dust is being generated and assess the effectiveness of suppression measures such as fog cannons, spray bars and road dust control treatments.
PM2.5 particles are much finer and remain suspended in the atmosphere for longer.
Although quarries generally generate more PM10 than PM2.5, measuring finer particles provides a more complete understanding of overall air quality.
Real-time monitoring allows operators to identify changing conditions and respond quickly when dust concentrations begin to increase.
For most quarry operations, the answer is simple:
Both.
Monitoring PM10 alone provides valuable information about visible dust generation, while PM2.5 monitoring offers additional insight into finer airborne particles.
Together they provide a more complete picture of site conditions and help operators develop effective dust management strategies.
Monitoring should not simply collect data—it should help operators make better decisions.
Real-time monitoring can help identify:
By understanding both PM10 and PM2.5 levels, operators can optimise dust suppression while reducing unnecessary water use.
The most effective environmental management programmes combine monitoring with practical dust control measures.
For example:
Using monitoring data alongside suppression equipment allows quarry operators to respond quickly while continuously improving environmental performance.
Every quarry is different.
The number of monitoring stations, monitoring locations and the parameters measured should reflect the site’s layout, prevailing wind direction and operational activities.
At ODS, we help clients design monitoring strategies that provide meaningful environmental data while integrating seamlessly with wider dust control solutions.
PM10 refers to airborne particles up to 10 micrometres in diameter, commonly generated during quarry operations such as crushing, screening and vehicle movements.
PM2.5 consists of much finer airborne particles that remain suspended in the air for longer and can travel greater distances.
Many monitoring systems measure both particle sizes, providing a more complete understanding of site air quality and dust behaviour.
Monitoring itself does not reduce dust, but it provides the information needed to operate dust suppression systems more effectively and identify areas requiring additional control measures.
Yes. Modern monitoring systems can work alongside fog cannons, spray bars and road dust control solutions to improve overall dust management.