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If we are in a room with several people, measuring the CO2 concentration provides a measure of the percentage of air we breathe in that consists of air already exhaled by other people. CO 2 measurement offers a cost-effective solution for assessing the current risk from potentially infectious aerosols. Over 200 scientists recently appealed to the WHO to take airborne transmission of SARS-CoV-2 more seriously ( Morawska & Milton, 2020). If a healthy person inhales these contaminated droplets and the number of virus particles contained in them exceeds a minimum infection dose, the disease is transmitted. 2.7 hours ( source), the room air remains polluted for a longer period of time. At aerosol sinking rates of a few meters per hour (source) and a decrease in biological virus infection activity with a half-life of approx. If the respective person is infected with the virus, these droplets also contain virus particles. The air exhaled therefore contains CO 2 (4 % = 40,000 ppm) as well as tiny liquid droplets (aerosols), which due to their size can float in the air for a long time. Each person exhales about 8 liters of air per minute, which has been in intensive contact with the lung tissue. Where does indoor carbon dioxide come from?Ĭorrect, it comes from the exhaled air of people who are indoors. WHAT DOES INDOOR CO2 CONCENTRATION HAVE TO DO WITH CORONA INFECTION RATES? Not only in times of a pandemic (AI, SmartCity, spectrometer, level measurement of heavy rain, fine dust and much more).
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Use the IoT2 workshop, get informed about the background, develop your own ideas and build your own. You can find more tips and replication projects throughout Germany on Guido Burger's Twitter.
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We support you here with building instructions and scientific information. The IoT 2 workshop encourages the educational system to help itself. With the Internet of Things we network, enable the exchange of information and can also take climate protection aspects into account.
#THINGSPEAK TIMECONTROL LIMITATIONS HOW TO#
How about a web server, a cloud interface for an internal school competition on the topic of proper ventilation, or how to detect disinfectants in the air, or a pax counter to estimate the room occupancy? Because when we build it ourselves, we learn a lot about physics, biology, chemistry, as well as computer science and can even integrate additional features that hardly any standard device offers. After all, high CO 2 levels also reduce students' attention and learning behaviour.Ī CO 2 measuring device belongs in every classroom and in every lecture hall, either purchased or, even better, homemade. Even after the pandemic, targeted ventilation will help us to stop creeping fatigue processes in the classroom. With this participatory project for demand-oriented ventilation, we would therefore like to take the initiative to make the regular operation of our schools and universities in Corona times a little safer, while at the same time acknowledging climate protection. Too little ventilation increases the risk of disease, too much ventilation is harmful to the environment. To all those who doubt the existence of the virus or who want to know what the SARS-CoV2 virus looks like, we recommend this tweet from the DKFZ.Īccording to the current state of science ( Fennelly, Lancet, 2020), tiny liquid droplets (aerosols) play a much greater role in the spread of respiratory tract infections than previously suspected. If you still want to think about complex ideas, you are welcome to read on. We would never have thought that the solution would be so simple. Just in time for the end of the autumn vacations, the Lower Saxony Ministry of Culture has found a surprising solution to the ventilation problem: Great window hangers, even for self-printing, which are certainly effective in other German states as well. Department Environmental Business/Environmental Law.Department of Environmental Planning/Environmental Technology.Institute for International and Digital Communication (InDi).Institute for Micro Process Engineering and Particle Technology (IMiP).Institute for Biotechnical Process Design (IBioPD).Institute for Operations and Technology Management (IBT).Institute for Applied Material Flow Management (IfaS).Study Programmes & Continuing Education.