AIR MONITORING 23 Graphene gas sensors for real-time monitoring of air pollution


Scientists at the National Physical Laboratory (NPL), working with partners from the Graphene Flagship, Chalmers University of Technology, the Advanced Institute of Technology, Royal Holloway University and Linköping University, have created a low-cost, low-energy consuming NO2


sensor that measures NO2 direct result of exposure to ambient air pollution such as NO2 , SO2 , NH3, CO2 portions of the population in large cities, specifically London, have been consistently exposed to NO2


breathing problems, asthma attacks and potentially causing childhood obesity and dementia. NPL and partners have developed a graphene-based NO2


NPL has developed and demonstrated the novel type of NO2 for measurements of the exceedingly low levels of NO2 guidelines the targeted level of NO2 consumption miniaturised NO2


in urban areas with unprecedently high local resolution.


Olga Kazakova, National Physical Laboratory (NPL) states: “Understanding the problem is the first step to solving the problem. If you only monitor certain junctions or roads for NO2


pollution, you do


not get an accurate picture of the environment. In order to do this, a dense network must be set up to show the dynamically changing level of pollution through different times of day and year, so you can get to know the real level of critical exposure.” With the data provided by a dense network of graphene sensors, people could us an app to check how much NO2


to on their planned route, and city councils could use this information to dynamically restrict and divert cars near schools and hospitals. This would enable governing bodies to adopt smart and flexible restrictive measures in specific areas recognised as being highly pollutive.


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dioxin monitoring – GT90+ Gasmet GT90+ system for dioxin monitoring is a device designed for long-term monitoring of dioxin emissions in conformity to the European standard EN1948- 1 and EN15267. The system represents the cutting-edge technology for dioxin sampling and fulfils all the requirements of the dioxin measurement standard.


The MCERTS certified system for continuous sampling of dioxin emissions was designed for automated emissions monitoring of hazardous organic compounds in industrial and domestic waste incineration plants. In addition to dioxins, the system is capable of measuring furans and other persistent organic pollutants (POPs) such as polychlorinated biphenyls (PCBs) and polycyclic aromatic hydrocarbons (PAHs).


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London SMART 50 Award The Breathe London project has been announced as the winner of a SMART 50 Award by Smart Cities Connect, within the Digital Transformation category. Created to better understand Londoners’ exposure to air pollution, Breathe London combines state-of-the-art technology with new data analytics, delivering real-time air quality data at a hyperlocal level in the city.


The monitoring technology employed in the project’s network of over 100 AQMesh pods and in two Google Street View Cars was supplied by ACOEM Air Monitors. Their Managing Director Felicity Sharp congratulated all of the partners in the Breathe London project. “This has been a tremendous collaborative effort,


and I am delighted that our work is being recognised globally.


“The benefits of hyperlocal air quality data are already being realised in London and we hope that this can be recreated all over the world. The measurement of air pollution at an unprecedented scale and scope helps to identify pollution hotspots and informs the design and assessment of mitigation measures. It also provides local information that helps citizens take their own pollution reduction initiatives and make informed decisions such as where to walk, cycle, play and live.”


“London’s pollution problem is a health crisis, and we are proud to be part of this ambitious project shining a light on air quality,” said Elizabeth Fonseca, senior air quality manager at Environmental Defense Fund Europe, one of the project’s leading partners. “Lessons learned from Breathe London can help other cities trying to gain a better understanding of their pollution and protect public health.” Monitoring data from the AQ Mesh pods is compared against data from London’s existing regulatory grade monitoring network. Both open-source and available for download, the stationary and mobile data are presented on an innovative platform to improve the public’s understanding of the varying presence of pollution across both time and space. See www.breathelondon.org.


By assessing and documenting the benefits of policy interventions, such as London’s Ultra Low Emission Zone, Breathe London is lowering the barriers for other cities to undertake sophisticated monitoring and modelling, and informing smarter, targeted policy. A representative from Environmental Defense Fund Europe will be presented with the Breathe London award at the 2020 Smart 50 Awards Gala, which takes place during April in Denver, Colorado.


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TSI’s DustTrak™ Environmental Monitors are real-time, near reference aerosol instruments, which can be deployed remotely in under an hour. DustTrak Environmental Air Monitor models 8540 and 8543 are data- logging, light-scattering laser photometers designed to fit inside the DustTrak Environmental Monitor Enclosure.


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and CO. One of the most dangerous pollutants, NO2 levels above the legislated limit. Even at very low concentrations NO2


levels in real-time. The World Health Organisation reported that 4.2 million deaths every year are a gas, is produced by burning fossil fuels e.g. in diesel engines. Significant is toxic for humans, leading to


detector that reports pollutant levels based on changes in its electrical resistance. The high sensitivity of graphene to the local environment has


shown to be highly advantageous in sensing applications, where ultralow concentrations of absorbed molecules induce a significant response on the electronic properties of graphene. The unique electronic structure makes graphene the ‘ultimate’ sensing material for applications in environmental monitoring and air quality.


sensors based on different types of graphene. This low-cost and technologically simple solution uses simple chemiresistor approach and allows e.g. below 10 ppb. 1 ppb is a concentration equal to a droplet of ink in 2 Olympic size swimming pools. According to the World Health Organisation’s pollution in cities is 21 ppb however, the typical average level in London is 30-40 ppb. There is a well-demonstrated global need for high sensitivity, low-cost, low-energy gas sensors to be deployed in a dense network and to be used to pinpoint and avoid high pollution hot spots. Such sensors operating in real-time can help to visualise pollution


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