Ключевые слова: adult, aged, air, asthma, background, bacteria, brush, building, care, ceiling, chest, cleaning, cold, conditioner, conditioning, copd, cough, dirty, disease, duct, dust, dusty, factory, fresh, handyman, health, heating, home, house, human, illness, industrial, infection, interior, lung, maintenance, medical, medicine, metal, office, old, pneumonia, pneumoniae, respiratory, sick, streptococcus, tuberculosis, vent, ventilation, wall,