Environmental health preservation

(1) The Basic Concept of the health-preserving environment The so-called health-preserving environment refers to the external conditions formed by the combination of factors such as air, water sources, sunlight, soil, vegetation, residences, and social culture, which are conducive to human life, work, and study. (2) Residential Environment 1. Residential Site Selection Generally speaking, it is advisable to choose a location that is close to mountains and water for building residences. Building houses along the mountains, in winter, the mountains and the trees on them act as natural barriers, which can shield against fierce sandstorms and slow down the cold air currents. The thick forest on the mountain in summer can reduce the intense radiation of sunlight, regulate the hot climate, and the shady green trees, the singing of birds and the fragrance of flowers make people feel as if they are immersed in the beautiful nature, adding more charm to life. Living by the water makes daily water use convenient. Especially the clear and sweet mountain spring water that flows all year round can moisten the air and is rarely polluted. For most areas in China, the best orientation for building a house is to face south with its back to the north. (1). It is conducive to room temperature regulation (2). 3. Preventive health care measures (1) Greening the environment A lush and verdant environment is not only beneficial to human metabolism, but also has a regulatory and calming effect on the mind. It can also reduce pollution, improve the climate and protect human health. (2) Improve environmental hygiene. (3) Control pollution. (3) Indoor environment and health. 1. The structure of a living room requires a spacious and moderate living area. It meets the requirements of hygiene. The normal living space is about 15 square meters. For urban housing, the average area per person is 6 to 9 square meters, and for rural housing, 8 to 12 square meters is appropriate. The clear height of the living room is 2.6 to 2.8 meters. It can be slightly higher in hot areas and slightly lower in cold provinces. The depth of a room refers to the distance from the inner surface of the exterior wall where Windows are opened to the inner surface of the opposite wall. The depth should not exceed 2 to 2.5 times from the ground to the upper edge of the window. For those with Windows on both sides, the depth can be increased to 4 to 5 times this height. In addition, the ratio of the depth to the width of a room should not exceed 2 to 1, and it is best to be 3 to 2 to facilitate the arrangement of indoor furniture. 2. Indoor microclimate: Indoor microclimate refers to the indoor climate that is different from the outdoor climate due to the effect of the enclosure structure (walls, roofs, floors, doors and Windows, etc.). The suitable indoor temperature in summer is 21℃ to 32℃, with the optimal range being 24℃ to 26℃. The relative humidity of the air is 30% to 65%, and the air flow velocity is 0.2 to 0.5m/s, with a maximum not exceeding 3m/s. The suitable range of indoor temperature in winter is 16℃ to 20℃. The moisture content is 30% to 45%. The airflow velocity is 0.1 to 0.5m/s. 3. Indoor lighting: Ultraviolet rays in sunlight have the effects of preventing rickets, enhancing immunity, and killing bacteria and reducing inflammation. Ensure that there is appropriate indoor lighting. In the colder northern work areas during winter, south-facing rooms should receive at least 3 hours of sunlight every day, while rooms facing other directions need more. In summer, try to minimize sunlight exposure to prevent the room temperature from being too high. 4. The exterior corridor of a corridor-style residence (with rooms on one side and an open corridor on the other) not only serves as a balcony and provides shade but also is more likely to create a through wind, making it suitable for hot regions. Extracted from "Cultural Health Preservation Network"