For many construction and mining sites, maintaining safe air quality levels is a key priority. Not only do safe air quality levels ensure the health and wellbeing of site workers, but they also ensure compliance with environmental and regulatory standards.
Here’s what you need to know about air quality and how it’s measured.
What is air quality?
Air quality provides a measure of the cleanliness of the air we breathe based on the levels of pollutants present. While good air quality means that the air is clean and safe to breathe, poor air quality suggests the presence of hazardous substances that can impact human health, ecosystems and even machinery.
Air quality is typically assessed based on the presence of specific pollutants, including:
- Particulate matter (PM10 and PM2.5): Tiny airborne particles from dust, smoke, construction, mining, and vehicle emissions. PM2.5 particles are invisible to the naked eye and small enough to enter the lungs and bloodstream, making them especially concerning.
- Nitrogen oxides (NOx): Gases produced from combustion processes, like engines and industrial activity.
- Sulphur dioxide (SO2): Released from burning fossil fuels, especially in mining and power generation.
- Carbon monoxide (CO): A colourless, odourless gas produced from the incomplete combustion of fuels.
- Ozone (O3): A secondary pollutant formed when NOx and volatile organic compounds (VOCs) react in sunlight.
Due to the nature of activities often carried out on construction and mining projects, these types of worksites are often home to high levels of airborne contaminants, including dusts, fumes, vapours, smoke and aerosols.
In response to air quality concerns in the workplace, Work Safe Australia introduced several work health and safety (WHS) laws that require workplaces to maintain certain air quality levels based on the specific contaminants. Known as workplace exposure limits, these thresholds can’t be exceeded on-site.
Understanding what’s in the air and how much of it is the foundation of effective environmental management and maintaining regulatory compliance. That’s where air quality measurement comes in.
How is air quality measured?
At Control Hire, we measure air quality using a specific combination of scientific instruments and data analysis techniques designed to detect and measure the quantity of pollutants in the air. The methods and equipment we use are typically tailored to suit your purpose. Here’s how it works.
Air quality index (AQI)
The AQI is a standardised system that’s commonly used to depict air quality. In short, it takes complex pollutant data and converts it into a simple, colour-coded scale ranging from 0 (Good) to 500+ (Hazardous).
The AQI incorporates several major air pollutants, including particulate matter, carbon monoxide, sulphur dioxide, nitrogen dioxide and ozone.
Key air monitoring methods
There are several methods that are commonly used to measure air quality, ranging from on-site monitoring systems to complex laboratory tools.
Gravimetric sampling involves collecting and weighing particles on a filter over time. These filters are then weighed within a laboratory setting to determine the concentration of particulate matter. While this method is highly accurate, it doesn’t provide results as quickly as other real-time methods.
Real-time monitoring systems are installed on-site, providing instant data on air quality levels. Nephelometers, beta attenuation monitors (BAMs) and optical particle counters are often installed on-site, allowing for continuous compliance monitoring.
Dust deposition gauges are particularly important for mining and construction sites. These gauges measure how much dust settles over time.
Monitoring locations and frequency
While the air quality monitoring methods and equipment are important, the location and frequency of monitoring on-site are just as critical. At Control Hire, our team of engineers strategically position monitoring equipment to:
- Assess worker exposure,
- Monitor site boundaries to evaluate off-site impacts, and
- Measure upwind and downwind conditions to identify pollution sources.
Depending on your project, monitoring can be completed over the short term for spot-checking compliance or over the long term for ongoing regulatory reporting.
Who needs air quality monitoring?
Air quality monitoring is an essential compliance requirement across a number of industries, including construction, mining and infrastructure development. People conducting a business or undertaking (PCBUs) must ensure that their worksite complies with work health and safety (WHS) laws, as well as the standard exposure limits set by Safe Work Australia.
Poor air quality puts site workers, the local community and the surrounding environment at risk or harm. Beyond the risks to others, non-compliance with the relevant air quality standards also leaves your worksite and business at risk of reputational damage, harsh fines and serious legal repercussions.
Control Hire’s dust and air quality consulting services
At Control Hire, we offer specialist dust and air quality management solutions that are tailored to your mining, construction or industrial project. Whether you’re after reports to support DA applications, you need to meet site-specific requirements or demonstrate long-term compliance, Control Hire can help.
Our team of in-house engineers bring with them years of specialist expertise, allowing them to create a custom monitoring solution to ensure the safety of your site while maintaining regulatory compliance. Plus, with access to cutting-edge technology for dust, fume and gas suppression and monitoring available for hire or purchase, Control Hire has all of your air quality measurement and management needs covered.
Get in touch to learn more about our air quality consulting solutions: