Common undesirable phenomena at insulated schools
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Vitiated air contains unhealthy carbon dioxide and also creates an environment where many infectious agents are spread easily
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Formaldehyde and other toxic substances vaporise from the painted desks and furniture. In many places there are occurrences of the radioactive gas radon.
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Those substances together with dust, odours, humidity, moulds and fungi does not get ventilated due to airtight insulation.