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In the recommendations for the operation of air conditioning and ventilation systems in buildings to prevent the spread of SARS-CoV-2 from the Ministries of Health and Energy Efficiency, its use is recommended in places with difficulties in obtaining satisfactory ventilation.
No, the CSIC guide itself does not recommend them, since these systems with ionizers or ozone production generate reactions with other elements of the atmosphere that are not controlled and have negative consequences for the formation of pollutants. In fact, tropospheric ozone (the one in contact with the earth’s surface, different from the stratospheric one that protects us from UV rays) is a powerful environmental pollutant.
The Ministry of Health has also issued notes reminding that neither ultraviolet-C radiation nor ozone and other biocides can be applied in the presence of people. Its improper use introduces a double risk: possible damage to human health and giving a false sense of security. These systems are only handled by specialists with appropriate protective equipment.
Some studies indicate that it does not. After analyzing more than 700,000 parameters in 36 schools in 33 Spanish cities during a school year, the School Monitoring Study prepared by the Passivhaus Building Platform (PEP) and the University of Burgos indicates that the conditions of comfort, environmental quality and ventilation inside schools in Spain “they suspend any evaluation in a generalized way”, regardless of the climatic zone, type, age and the particular casuistry of each school. In the case of CO2 levels, the measurements made exceed the acceptable ratio for 68% of the time the centers are used.
Although without scientific value, an experiment or study on ventilation carried out in a Secondary classroom by Professor Javier Pérez Soriano for two days at the I.E.S. Andalusian poets from Benalmádena (Málaga), opening and closing windows in different time frames, highlight the need to ventilate the classrooms “yes or yes”. According to the teacher, while the pandemic lasts, unfortunately, the use of a coat indoors will be common in winter.
The experts and the CSIC guide itself insist that outdoor activities are always preferable to indoor ones, but they do not go into details. Teachers and those in charge of the centers will have to assess those that can be done outside and those that cannot, especially during cold months.
In the last century, when distance education was not possible, both in Europe and the United States classes were taught outside the classroom in the middle of winter due to tuberculosis epidemics and pandemics such as the Spanish flu.
Information and news magazine of the island of La Gomera. Plural and progressive information.