A month after the return of the children to school, a worrying question: that of Covid-19 contamination. To prevent its spread in classrooms, many infectious diseases specialists recommend the use of CO2 sensors.

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Co2 sensors: a solution to limit Covid-19 contamination?

In recent days, Alexie and the other students have taken on a new habit: pay attention to the colors that appear on the box installed at the back of the classroom. “In fact when it is green it means that there is enough air in the classroom for the virus to come less on us. And when it goes in orange, that means that there is not too much air and when it is in red, the windows have to be opened even more » explains little Alexie.

The less the air in the room is renewed, the more the CO2 level increases. The risk of transmission of Covid-19 is becoming greater. In this school, sensors have been installed in several classrooms and in the dining hall.

Room ventilation is essential

This measure is essential for infectious diseases specialists, who have extensively studied the modes of transmission of the virus. “We realized that the covid-19 coronavirus was transmitted mainly by aerosolization. This means that when we breathe, we emit a small cloud that we can see very well for example in winter, in the street when it is cold. If the room is not ventilated, the cloud can hover for several minutes, sometimes even for several hours, and imagine that this cloud is that of our aerosols and that it contains coronavirus, then if you stay in the part, you too for several hours, you risk infecting yourself with this coronavirus ” explains Professor Antoine Flahault.

While sensors are recommended, they are currently not used everywhere. Scientists and parents’ associations are calling for CO2 sensors to be compulsory in schools.