Survey
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
Atmosphere E Indoor Air Quality Indoor air quality refers to the properties of indoor air that affect the health and wellbeing of those in it. There have been as many as 900 contaminants identified as present in indoor air at ppb or higher. Types of contaminates VOCs are volatile organic compounds such as formaldehyde (H2CO), benzene (C6H6), toluene (C7H8), chloroform (CHCl3), acetone (C2H6O) and styrene (C8H8). These come from cleaning products, plastics, perfumes, hair sprays, paints, carpet, furnishings, dry-cleaned clothes, plywood and other products. Biological Contaminants Molds, fungi, bacteria, viruses, pollen, and insects. In order to lessen biological contaminants, indoor humidity should not exceed 50%. Combustion Products Carbon monoxide, nitrogen dioxide, sulfur dioxide, tobacco smoke components, and polyaromatic hydrocarbons such as benzo [a] pyrene. Contaminants generated by office equipment and supplies such as ozone from computer terminals and photocopiers, ethanol and methanol from duplicating machines, and acetone from typewriter correction fluid. Environmental tobacco smoke (ETS) It is estimated that 470,000 tons of tobacco are burned indoors each year generating both mainstream and sidestream smoke. The concentration of pollutants include: 1. air exchange rate 2. the rate at which pollutants are generated indoors. 3. reaction rates among indoor air components. RADON Radon is a radioactive, colorless, odorless and tasteless gas formed by the nuclear decay of U-238 in ground under and around buildings. When inhaled it can cause lung cancer. It is measured in picocuries per liter. A picocurie is equal to about 4 nuclear disintegrations per minute or about 16 nuclear disintegrations per minute in a liter of air. FORMALDEHYDE Formaldehyde, H2CO is a pungent-smelling gas found both indoors and outdoors. It comes from carpets, cabinets, cigarettes, and insulation. Phenol-formaldehyde and ureaformaldehyde resins are found in plywood and foam insulation (UFFI). UFFI was banned in 1982 but a court action reinstated its use in 1983. Formaldehyde irritates tissue and is a possible carcinogenic (cancer causing) chemical.