SARS-CoV-2: CO2 traffic signals can be used as an orientation guide for good or bad ventilation.

Carbon dioxide has long been regarded as a good indicator of air exchange, a CO2 concentration in the interior of less than 1,000 ppm (0.1 vol-%) indicates a hygienically adequate air exchange under normal conditions (IRK): “CO2 traffic signals can thus provide a quick and simple indication of whether and when ventilation is necessary.

The idea of installing CO2 measuring devices in practices is therefore not about extreme CO2 values, but the measurements can be an aid to infection protection in corona times: “Because if there is a lot of exhaled CO2 in the air, there are also a lot of aerosols in the air” and thus the risk of infection is increased. In contrast to CO2 measuring devices, CO2 traffic signaling is simple and inexpensive: “Indicators in yellow and red warn of a lot of CO2 in the air, and thus also of many aerosols.

However, the installation of CO2 sensors does not mean that a CO2 concentration of less than 1,000 ppm basically protects against infection with SARS-CoV-2, according to the IRK. But CO2 concentrations significantly or permanently higher than 1,000 ppm in schools, offices and private households indicate inadequate ventilation management with a potentially increased risk of infection. This applies not only to window ventilation, but also to the operation of ventilation systems.
Author(s) Source
Schenk M Medscape 19.08.2020 (german original)
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