室内有害气体的来源与危害（The sources and harms of indoor harmful gases）.doc

室内有害气体的来源与危害（The sources and harms of indoor harmful gases） Types, sources and hazards of main pollutants in indoor environment Indoor environmental pollution, the kinds of main materials, environmental quality are affected and polluted in many ways, and can be divided into three broad categories. A: physical pollution, including noise, light radiation, electromagnetic radiation, radioactive pollution and so on, mainly from outdoor and indoor electrical equipment. B: chemical pollution, building decoration materials and furniture products released volatile compounds, dozens of species, of which formaldehyde, benzene, radon, ammonia and other four indoor harmful gases are particularly serious harm. C: biological pollution, mainly mites, termites and other bacteria, mainly from carpets, blankets, wood products and structural subjects. The main sources and harms are formaldehyde, ammonia, radon, benzene and radioactive substances caused by improper decoration, which are the main sources of indoor environmental pollutants. Sources and hazards of a: radon gas. Radon gas is a radioactive substance precipitated by granite, cement, slag, brick, gypsum and other building materials. Mainly from inorganic materials with natural stone (marble, granite, mainly gypsum, cement, sand and slag) and comprehensive utilization of industrial waste residue after products (coal gangue brick, fly ash products). Radon is very easy to enter the lungs with human breathing, damage the respiratory organs of the human body, serious can lead to lung cancer; natural stones in the ray will damage the human hematopoietic function, leading to leukemia. Sources and hazards of b: formaldehyde. Formaldehyde is an organic compound, colorless, soluble, and has a strong pungent odor. The material mainly comes from interior plywood, blockboard, MDF and particleboard, as well as wooden furniture made from artificial boards and bad wood glue. Other decorative materials, such as certain chemical fiber carpets,