Category: Product update

New modular options for AQMesh air quality monitoring systems

The AQMesh small sensor air quality monitoring system already offers flexibility of monitoring location – through independent power and communications – as well as high data quality and traceability. Now the platform is even more flexible offering up to 20 different data channels. The wide range of sensors, including gases such as NO2, particulate matter (PM1, PM2.5 and PM10) wind and noise can be specified, from a single sensor to a ‘fully loaded’ mini air quality monitoring station.

The small, post-mounted monitoring pod sends raw sensor output to the AQMesh server using the mobile phone network and readings can be accessed by a secure login or API connection. Cloud data management allows settings to be changed online and makes a high level of remote support possible – ideal for monitoring in distant or hard-to-reach locations. Recent developments for 2019 mean that AQMesh offers an increased level of modularity unrivalled by any other small-sensor air quality monitoring system.

The full range of sensors includes gases NO, NO2, O3, CO, SO2, H2S and CO2. Recent work has shown the value of measuring a targeted combination of gases for a given application. For example, H2S and SO2 is popular with the oil and gas industry and measurement of CO2 is valuable as an indicator of combustion to calculate an index. The new wind speed and direction module means local pollution source apportionment can be carried out. All AQMesh pods measure environmental conditions – temperature, atmospheric pressure and RH% – in the same compact unit.

New pods can be built to almost any configuration and modifications can be and are carried out to existing pods returned to the factory. Some modifications are also possible in the field, such as adding extra gas sensors.

Most AQMesh pods are now powered using solar power and the new AQMesh solar module allows the pod and solar pack to be mounted on the same post, using the standard clips supplied, with the power cable simply connected together to start monitoring. The updated solar pack comes as a complete package with a 20W panel, more efficient charging, an additional port for powering two pods, and is now a smart system with a Bluetooth mobile app for checking the output of the panel and running basic diagnostics. Battery and direct (9-24V DC) power options are available. is the AQMesh server which performs secure data processing using carefully developed, unique correction algorithms which compensate for cross-gas effects and environmental factors. AQMesh algorithms are fixed by version and completely traceable, with no use of machine learning or artificial intelligence. Continual development of these algorithms, using datasets from around the world which compare AQMesh readings with co-located reference data, allows AQMesh to demonstrate outstanding, accurate and repeatable performance when co-located against certified reference or equivalent methods, in any part of the world.

AQMesh pods require very little ongoing maintenance, meaning the cost of ownership remains low. Sensor replacement is recommended every 2 years and the demonstrated data stability is very high. AQMesh users also benefit from dedicated, global support from its UK base, where it is designed, developed, manufactured and distributed, as well as a network of trained distributors.


Read more about AQMesh.

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Latest AQMesh co-location studies show capability of small sensor systems

AQMesh air quality monitor and new solar panel power optionRecent co-location comparison trials against certified reference equipment continue to prove AQMesh performance and reliability for localised air quality monitoring.

Trials in the USA, UK and Western Europe this year have delivered high correlation coefficients (R2 values) for key pollutants such as nitrogen dioxide (NO2), ozone (O3) and fine particulate matter (PM2.5). An R2 value of 0.92 against reference for O3 was achieved in Southern USA over the Summer, as well as an R2 value of 0.94 against reference for NO2 in Northern USA during the cold season.

Co-location trials for AQMesh and field equivalent methods have been taking place globally for several years, with the results published on the AQMesh website, demonstrating how performance and accuracy continues to improve with each new version of the product. A number of independent studies have also been carried out, verifying the AQMesh system’s capability.

AQMesh is a small sensor air quality monitoring system for measuring pollutant gases and particles in ambient air. It is a flexible, quick to install and easy to use air quality monitor that can deliver localised, real-time readings, aiming to improve the spatial resolution, scope and accuracy of gathering air quality data.

Its range of wireless power options includes a recently improved smart solar panel, which is now larger than the previous and has a more efficient charge, allowing for year-round operation for standard gas and particulate AQMesh pods across Western Europe and regions on a similar latitude.

AQMesh pods can now monitor up to 6 gases out of NO, NO2, NOx, O3, CO, SO2, CO2 and H2S using the latest generation of sensors, as well as PM1, PM2.5, PM10 and total particle count (TPC) with a light-scattering optical particle counter. In addition to pollutants, AQMesh can measure noise, relative humidity, pod temperature and atmospheric pressure, all within a single compact unit. Data is completely secure on the AQMesh cloud server, only accessible by a secure login, which allows the user to manage their pods, view customisable graphical data, and download the data for further analysis.

AQMesh is currently in use throughout the world in a variety of air quality monitoring applications and projects, including smart city networks, indoor-outdoor air quality management, employee health and safety, traffic pollution mitigation studies and air quality modelling. Recent case studies show it forming part of a major ‘hyperlocal’ street-by-street monitoring system throughout London (UK), as well as being used in a similar project across 50 zip code areas in Minnesota (USA).


Learn more about AQMesh.

Browse AQMesh co-location comparison trial results.

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AQMesh introduces new CO2 and H2S monitoring capability

AQMesh is now able to offer CO2 and H2S within its range of gas options for local air pollution monitoringAQMesh is now able to offer CO2 and H2S within its range of gas options for local air pollution monitoring.

The NDIR CO2 sensor, which can be offered within a single AQMesh pod alongside five other gases out of NO, NO2, O3, CO, SO2 or H2S, as well as PM1, PM2.5, PM10, temperature, pressure and humidity, has been developed to deliver a higher performance than those typically used for indoor air quality monitoring. It has been rigorously tested against Picarro reference equipment, resulting in an R2 value of 0.93. Pod-to-pod correlation of over 20 AQMesh pods has shown R2 values of 0.98 and 0.99, and the sensor has a MAE (mean absolute error) of less than 20ppm.

In addition to monitoring deviations from ambient levels of CO2, elevated CO2 levels can indicate that monitoring is taking place in a combustion plume and levels of other gases can be interpreted accordingly. For example, the ratio of CO2 to the other pollutant gases present can indicate whether those gases were emitted by a local or distant source.

An additional electrochemical sensor has been introduced to offer H2S measurements. After integrating the sensor, measurements have been compared to readings from a Honeywell SPM Flex installed at a sewage treatment site with an R2 value of 0.87 over a measurement range of 0-150ppb. Particularly of interest to the oil and gas industry, in association with the SO2 monitoring already available on AQMesh, it can be used to measure emissions from sour gas and residual emissions from flaring operations.

AQMesh can measure up to 6 pollutant gases in various combinations, as well as particulate matter, humidity, atmospheric pressure and noise in one small, compact easy-to-install unit. There is a range of wireless power options, including lithium battery packs and solar panels, with information sent in near real-time to a secure server via cellular GPRS. Data can be accessed by a secure login or can be streamed via an API connection.

AQMesh pods are in use across the globe in a variety of indoor and outdoor air pollution monitoring applications, and are becoming increasingly popular in smart cities and networks. Pod performance has been proven through extensive testing in worldwide co-location comparison trials with reference equipment, which have delivered impressive and reliable correlation results.


Learn more about AQMesh.

Browse AQMesh co-location comparison trial results.

Read more AQMesh news.

Crushed AQMesh pod still working perfectly

An AQMesh pod used in the recent Citi-Sense project in Norway was returned to us at the end of the project, and we were surprised at the condition. Despite the damage, this robust little pod was still working perfectly, with data still being received.

AQMesh pods are able to measure up to 6 gases, including NO2 and CO2, particulate matter, noise and atmospheric conditions within a variety of environments – and it seems they can also possibly withstand significant damage.

For more reasons to choose AQMesh, click here.

AQMesh solar unit gives flexible air quality monitoring

January, for many of us, is a surprising time to focus on solar energy but a new solar power unit designed specifically to power the AQMesh air quality monitoring system can power a full-specification pod throughout any western European winter.

Lithium batteries established AQMesh as the first reliable ‘small sensor’ air quality monitoring device that is completely independent of power supply, as well as communications infrastructure – but even the best batteries need to be replaced eventually. The solar power unit includes a back-up battery and requires just a single connection to a matching lead on the pod. The unit is also very simple to mount on a post, wall or fence as required, and includes a compass for alignment and the facility to tilt the panel to achieve maximum solar energy.

“We designed this power unit specifically for AQMesh. AQMesh is low-power so we used the smallest possible solar panel necessary to measure all parameters at all reading and transmission frequencies”, comments AQMesh Technical Director, Steve Earp. “We know that users are concerned about large or heavy objects on posts but the combined package of an AQMesh pod on a post with this solar power unit has a very low impact.”

Stephen Hoskin, Sales Manager at Air Monitors Ltd, has installed and supported hundreds of AQMesh pods in the UK in a variety of environments. He says “For longer monitoring projects involving the measurement of particles, the AQMesh solar power unit provides a convenient, cost efficient and unobtrusive way of keeping the pod running continuously without having to change the battery. The solar power unit is very easy to install, featuring a push fit connector for the cable from the pod and contains a small back up battery to power the pod even on long dark winter days.”

AQMesh can measure NO, NO2, O3, CO, SO2, PM1, PM2.5, PM10, noise, pod temperature, atmospheric pressure and relative humidity from a single pod – and can now be powered by a DC connection to a solar power unit measuring 445 x 250 x 290mm and weighing 5.5kg. AQMesh has been installed in a range of applications including pollution hotspot identification, and performance has been routinely demonstrated and proven in a series of global co-location comparison trials.

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Watch the webinar: Introduction to AQMesh

AQMesh podWatch our webinar from today about AQMesh, covering topics including:

  • What is AQMesh?
  • Which ambient air pollutants does it measure – and how?
  • What applications is it used for?
  • Q&A


AQMesh: a new option for flexible air quality monitoring

AQMESH_pmAQMesh has an impressive collection of global users and performance results measuring ambient air quality in applications ranging from traffic planning and urban hotspots to industrial fence line monitoring, building ventilation management, or environmental lobbying. This pole-mounted unit comes with an independent power supply and communications, so offering the possibility of measuring air quality exactly where it is required. Readings are accessed securely online at intervals as short as 5 minutes and can either be downloaded manually or linked to another application.

Each small (2.5kg) pod can measure up to six gases, including NO2 and now CO2, as well as PM2.5, PM10, and environmental conditions. As the units use standard fittings, installation is speedy and a city can be fitted with 20 units in one morning. Accuracy is optimised by using the best available sensors for detecting low levels of ambient pollutants and applying processing which gets the best possible performance from them.

During the five years of the product’s development, the AQMesh team has built on the founding partnership with the University of Cambridge and collaborated with air quality teams worldwide to constantly compare performance against reference stations. These co-location comparison trials have shown how closely AQMesh can track reference readings and also provided continuous insights into how performance can be improved. These impressive comparison trial results are shown in the performance section on the AQMesh website.

AQMesh does not offer an alternative to a full reference station but can help to fill the data gap between sparse reference method monitoring points and diffusion tubes which lack time resolution. In fact, the combination of AQMesh and reference method monitoring stations is particularly powerful, as co-location against the reference station and scaling applied to the AQMesh server provides a reliable calibration method.

AQMesh-monitors-traffic-pollutionEach individual AQMesh pod measures only 20cm and can monitor NO, NO2, O3, CO, SO2, CO2, PM1, PM2.5, PM10, noise, pod temperature, relative humidity and atmospheric pressure, available as a range of options. The power source can also be chosen to suit the application, with independent supply being key. In addition to its range of battery options, AQMesh can now be powered by a small, neat and self-contained solar power unit. This low power platform is key to the versatility of the equipment, meaning that it can be located literally anywhere and operated for years with minimal or even no maintenance.

AQMesh is designed and manufactured in the UK and supported globally, and as worldwide concern for air quality continues to grow, AQMesh is rapidly being proven to be the only reliable solution with the accuracy and precision for local ambient air pollution monitoring. Hundreds of units are in use worldwide by leading academic institutions, environmental monitoring authorities and private companies in a range of pollution monitoring projects, including real-time NO2 monitoring and NOx measurement for traffic pollution analysis. AQMesh is also currently in use across a number of cities as part of the EU-funded Citi-Sense project.

Only 10 reasons to buy AQMesh?

That’s what we thought, but here’s another one: it was designed as a practical monitoring tool. AQMesh’s relatively tiny size means that on top of its proven accuracy, users can benefit from its neat ergonomics and complete practicality.

But why else would you buy AQMesh?

  1. No other commercially available outdoor air quality monitor can demonstrate the same level of accuracy
  2. AQMesh can be installed anywhere, completely unconstrained by power and communications cables
  3. It’s an all-inclusive package, measuring 5 gases, 4 particulates, and environmental conditions
  4. AQMesh was developed through world-class partnerships
  5. Your data is completely secure
  6. Anybody can install, maintain and operate AQMesh
  7. AQMesh can be managed from easy-accessible settings on a secure online dashboard
  8. The instrument has the quality you expect from a leading manufacturer
  9. AQMesh is fit for purpose
  10. We provide real, ongoing user support
  11. AQMesh was designed as a practical tool

Read the full article & reasons.