Good ventilation of the room is especially necessary if the windows of the building reach the roadway of the street, along which a dense flow of cars is constantly moving. Alas, living in the center of Moscow or St. Petersburg is not sugar. Many are already trying to get rid of hated housing in the center in order to find peace somewhere on the outskirts of the city, or to move to the countryside, where the air is much cleaner. However, a good air conditioner will come in handy in rural areas: in addition to air purification, it helps to keep the desired temperature in the room.