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The school year in the country has begun.

After the opening celebration, today students sit at desks in classrooms.

Start of the new school year. Happy first day of school!

The "Do you know what you're breathing?" campaign tests with thousands of sensors the purity of the air that students breathe.

"In addition to the external factors of pollution, there is another phenomenon - in schools in recent years there are energy efficiency programs that make insulation, change window frames, but thus seal buildings that stop breathing," said the organizer of the campaign "Do you know what you breathe?" Hristo Atanasov in the studio of "Bulgaria morning".

He noted another problem - the high temperatures in the rooms and the infrequent ventilation during the learning process.

"Parents think that if their child is in the cold, they will get sick. This creates the opposite effect, they stay warmer than they should, the high temperature and stagnant air contribute to the development of viruses. We think that heat helps, and it increases the harm. Everything leads to the air being extremely stagnant, "said the guest.

In the beginning, the campaign started with the deployment of sensors in 3 schools, more than 20 more joined. The campaign was joined by a school from Vratsa, Sofia, Plovdiv, Gorna Oryahovitsa. Sensors are to be placed at a school in Montana.

"The effect to get is to start understanding the problem - to see it and start working. Not to ventilate winter when it is cold is a habit that has been created. We are working on people's awareness to start acting, "Hristo Atanasov told Bulgaria ON AIR.

Every teacher sees on a dashboard what air quality is in classrooms. The guest explained how the reduction in carbon dioxide affects students' results: "There is a health hazard when the amount of oxygen decreases, there is a health hazard from the stagnant air itself. If the amount of carbon dioxide in the classroom is 600, the average student would have 70 out of 100 points per exam, with 1000 - they have 60 points, with 2500 - 30 points.

Atanassov noted that before the start of school hours the levels are normal, then 1000 pass, often 2000, rarely 4500-5000, which is an immediate danger to health.

He announced that for every sensor purchased from a private company in a city, one will be donated to a public school.