air pollution讲.ppt

Main contents What is Air Pollution Outdoor Pollution Indoor Pollution Health Effects Prevention What is Air Pollution Air pollution is made up of many kinds of gases, droplets and particles that reduce the quality of the air. Types The release of particles into the air from burning fuel for energy. This type of pollution is sometimes referred to as black carbon pollution. The release of noxious gases, such as sulfur dioxide, carbon monoxide, nitrogen oxides, and chemical vapors. These can take part in further chemical reactions once they are in the atmosphere, forming smog and acid rain. Outdoor Activity Smog is a type of large-scale outdoor pollution. It is caused by chemical reactions between pollutants derived from different sources, primarily automobile exhaust and industrial emissions. Cities are often centers of these types of activities, and many suffer from the effects of smog, especially during the warm months of the year. consequence of outdoor air pollution acid rain Greenhouse Effect Ozone depletion Indoor Pollution Many people spend large portion of time indoors - as much as 80-90% of their lives. We work, study, eat, drink and sleep in enclosed environments where air circulation may be restricted. Sources of indoor air pollution: Tobacco smoke, cooking and heating appliances, and vapors from building materials, paints, furniture, etc. Health Effects short-term effects: irritation to the eyes, nose and throat, and upper respiratory infections such as bronchitis and pneumonia. Other symptoms can include headaches, nausea, and allergic reactions. Long-term health effects : chronic respiratory disease, lung cancer, heart disease, and even damage to the brain, nerves, liver, or kidneys. Continual exposure to air pollution affects the lungs of growing children and may aggravate or complicate medical conditions in the elderly. How to Prevent? Steps to stop the damage to our environment from air pollution.