Tetra Tech uses Zephyr® Monitors to Identify Dust Emissions at Construction & Waste Management Sites

Tetra Tech, a leading provider of consulting and engineering services, is using Zephyr® air quality monitors from EarthSense, the air quality expert, as part of its dust monitoring service.


Zephyr air quality monitor
Solar powered Zephyr® air quality monitor

Tetra Tech’s dust monitoring service will enable construction companies, construction waste management sites and waste recycling centres to identify whether onsite activities, such as operation of diesel-powered machinery or the demolition of buildings, is affecting the levels of dust and to ensure emissions stay within safe guidelines.


Tetra Tech has 21,000 associates working across the full project life cycle worldwide who are Leading with Science® to solve its clients’ most complex problems.


Tetra Tech uses the EarthSense MyAir® web application to view the real-time and historic measurements taken by the Zephyr® monitors to identify the times and locations at which pollution spikes occur and to understand how workers and individuals living nearby are exposed to dust emissions. During such periods, measured data will be compared against urban background data to understand whether pollution episodes are related to its client’s activities.


When exceedances are associated with on-site operations, Tetra Tech will use data from the MyAir® web application to alert its clients to allow them to quickly respond to high levels of pollution and minimise the associated risks of exposure to air pollution.


By regularly checking the MyAir® web application, Tetra Tech is able to notify clients of any exceedance within 24 hours of it occurring. This allows the source of the exceedance to be identified and the correct mitigation to be put in place. The firm advises on different approaches to mitigate against high levels of dust and will also provide a consultancy option to work alongside clients to develop strategies, such as trialling the use of solid or vegetative barriers between the site and nearby residents to minimise dust dispersion.


Tetra Tech will provide monthly reports as part of the service, which use particulate data taken by deployed Zephyr® monitors to communicate whether on-site particulate matter concentrations are within safe limits and to highlight any dust-related issues on site.


Anabel Lilburn at Tetra Tech said: “We use EarthSense’s Zephyr® monitors on site boundaries to provide monitoring data that is representative of sensitive receptors to help reduce the impacts on health from the particulate matter associated with construction site works. The real-time monitoring that EarthSense provides allows us to react quickly when exceedances occur, and contact site managers to ensure that the issue can be resolved efficiently.


“With the Zephyr® monitors being solar powered this allows us to monitor at the most sensitive locations on-site, where we may not be able to access external power. The monitors are also easy to install and move between locations, this benefits some of our work when we need to move the monitors due to the different phases a site may be in and when the clients need to move hoarding. Tetra Tech is happy with the services that EarthSense provides and the efficiency of its monitors and customer support,” continued Lilburn.


Managing Director at EarthSense, Tom Hall said: “The Zephyr® monitor is suited to construction and waste focussed applications as it can be used as a static or mobile tool, meaning it can be either be deployed at one location for longer term monitoring, such as comparisons against baseline measurements, or it can be moved around to various areas on-site to provide information about the air quality at different locations.”


“We’re pleased to see that Tetra Tech has installed seven Zephyr® air quality monitors across sites in London, as it’s a great step forward in better understanding how construction related operations affect air quality, the health of workers and residents and minimising the resulting health effects of exposure to particulate matter,” continued Hall.


Zephyr® monitors use an active sampling mechanism to draw in the available air which is released back into the atmosphere. After taking measurements for the volumes of air pollution, concentrations of particulate matter (PM1, PM2.5, PM10) in this application, data is sent to the MyAir® platform via Wi-Fi or GSM connection. The web application provides information about air quality concentrations, episodes, and trends for a wide range of gases and particulates in a format that is easy to understand and obtain by people working in various sectors.

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