Renlighet och frisk luft

A concise hygienic treatise outlines the benefits of fresh air and examines why indoor air becomes unhealthy, rejecting simple oxygen depletion or carbon dioxide accumulation as sole explanations. It surveys gases and toxic products of fermentation and decay and identifies human sources of contamination such as sweat, soiled clothing, oral and nasal secretions, intestinal gases, and disease-related respiratory decay. Practical guidance follows on defining fresh air, achieving adequate ventilation and air exchange in homes, and maintaining personal, clothing, and household cleanliness to prevent odors and airborne harm.