Study shows benefits of regular classroom ventilation – expat guide to Switzerland


A Swiss study has found that classrooms in poorly ventilated schools have up to six times more cases of Covid-19 compared to those that are regularly disseminated.

Research conducted by the Swiss Federal Laboratories for Materials Science and Technology (EMPA) analyzed data from CO2 sensors in 150 classrooms in the canton of Graubünden, before comparing the results with regular Covid tests carried out by schools. .

The correlation is clear: “more students and teachers have been infected with the corona virus in classrooms with poor air quality than in rooms that are regularly ventilated,” EMPA wrote on Thursday. . Poorly ventilated rooms – 60% of those studied, according to the canton of Graubünden – had six times more cases than better ventilated ones.

Researchers recommend ventilating classrooms more than usual, even when outside temperatures are low; they say three times an hour, for five minutes at a time, is better.

Further results from the cantons of Lucerne and Ticino are currently being analyzed before a final publication on the subject is released early next year, EMPA researcher Hossein Gorji told the Keystone-SDA News Agency.

Class struggle

The number of Covid people in Switzerland is currently higher than it has been for about a year, with a record 12,598 new daily infections recorded yesterday. Much of the transmission appears to occur in classrooms; in the week of november 29 to december 5, just under a third of total infections were recorded among people aged 19 and under. This age group represents one fifth of the total population.

As a result, debates around mask wearing and appropriate measures in schools continue. The last cantons to take action on Thursday were Bern, where the Christmas school holidays will start three days earlier than normal on December 21, and Schwyz, which made the mask compulsory for all children from the first year of primary school. . Zurich, the largest region in the country, will apply the latter rule from next January.

Keystone-SDA / back

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