While the circulation of the coronavirus seems to remain at a rather high level in France, many epidemiologists are now pushing to increase ventilation as much as possible, whether in public or private places.

In some schools, CO2 sensors make it possible to think about this gesture, but there are too few of them.

With more than 30,300 cases of Covid-19 identified on Tuesday, the circulation of the virus remains at a high level in France.

To reduce contamination, a simple and often forgotten gesture could nevertheless be very useful: opening windows.

In France, it was not until last October that ventilation was added to the official list of barrier gestures.

However, many epidemiologists believe that this is one of the most easily acceptable and effective weapons to curb the spread of the virus.

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An effective method against aerosols

And for good reason: more and more studies show that the coronavirus is transmitted mainly by air, via aerosols.

These aerosols are in fact the droplets emitted when we breathe or speak.

The lightest of them can float in the air.

However, in a closed room, these particles which can carry the virus can stagnate for a long time.

Hence the urgency to insist and "invest today in aeration, ventilation," said Antoine Flahault, professor of public health at the Institute of Global Health in Geneva, Wednesday on Europe 1.

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"A good investment for the future"

According to the epidemiologist, "this is really something that will be very, very helpful in solving the coronavirus crisis."

But the benefits could also be felt in the future.

"Beyond the crisis, this will make it possible to teach, to have shows and a sporting life in better ventilated, better ventilated premises and with cleaner air," he said.

"Either way, it's a good investment for the future."

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Concretely, CO2 sensors can make it possible to determine whether a room is sufficiently ventilated or not.

Of course, these small boxes worth around 50 euros do not indicate the amount of aerosols with the virus but they allow you to alert on the moment when it is necessary to ventilate the room.

For many epidemiologists, all schools, businesses and closed rooms should be equipped.

Apart from a few experiments in certain schools in the Hauts-de-France and Île-de-France regions, France is currently very far from the mark.