To prevent diseases of the respiratory system, it is necessary to observe cleanliness in the premises, the rules of personal hygiene and communication with patients, engage in hardening of the body. In a room where a lot of people gathered, the oxygen content in the air decreases, the amount of carbon dioxide and water vapor increases. A person in such conditions becomes lethargic, drowsy, quickly gets tired, suffers from a headache. Its performance drops. For human health, fresh air is needed. This is achieved by ventilation or systematic ventilation of the premises. Everyone should as much as possible be in the fresh air. It is good to sleep with the window open. The air of cities is often polluted by car exhaust, industrial waste, contains a lot of dust. Dust particles irritate the airways, carry numerous microorganisms
Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.