A CO2 meter is a device that measures the concentration of CO2 in a given space.

Measuring air quality with a CO2 meter helps to protect the population from the risks of contamination related to poor indoor air quality and is one of the bases of the strategy proposed by the Ventilation Task Force to ensure good air quality in closed spaces accessible to the public.
This Task Force has drafted recommendations for the selection and use of CO2 sensors in the specific context of COVID-19.

The role of the CO2 meter is crucial in limiting the spread of contaminants, including viruses. The concentration of CO2 depends on the number of people in a room and the physical activity taking place there. The higher the CO2 concentration, the higher the concentration of aerosols (microdroplets produced by respiration) that can be contaminated by microorganisms, bacteria and viruses. This situation increases the risk of contamination.
In closed spaces, the lack of ventilation promotes the spread of these contaminants. Airing and ventilating limit their transmission in the air.  

It is therefore recommended to use a CO2 meter in rooms dedicated to the public. If the concentration of CO2 exceeds the 900 ppm threshold, an efficient ventilation system and the presence of air purification devices are strongly recommended.

Here, you can find the obligations for manufacturers of CO2 meters.

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