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"We need fresh air" PPT courseware 2
hint:
Students in the group share the collected information together.
Fully express your opinions and ideas.
While communicating, choose one student from each group to take notes carefully.
Main sources and pollutants of the atmosphere
Air pollution sources are the sources of air pollutants, and there are mainly three types:
(1) Industry: Industry is an important source of air pollution. There are many types of pollutants emitted by industry into the atmosphere, some of which are soot and some of which are gases.
(2) Domestic stoves and heating boilers: A large number of domestic stoves and heating boilers in cities consume a large amount of coal. During the combustion process of coal, a large amount of dust, sulfur dioxide, carbon monoxide and other harmful substances are released to pollute the atmosphere. Especially during winter heating, polluted areas are often filled with smog and make people cough. This is also a source of pollution that cannot be ignored.
(3) Transportation: Cars, trains, airplanes, and ships are the main means of transportation in modern times, and the exhaust gases generated by burning coal or oil are also important pollutants. In particular, cars in cities are large and concentrated, and the pollutants they emit can directly attack people's respiratory organs. They seriously pollute the city's air and become one of the main sources of air pollution in big cities.
Dangers of air pollution
Polluted air not only harms human health, but also affects the growth of plants, destroys economic resources, and can even change the properties of the air in severe cases.
(1) Harm to human body
When the human body inhales polluted air, it can cause lesions in the respiratory, cardiovascular, nervous and other systems or cause other diseases.
(2) Harm to animals and plants
Animals are often poisoned or die by eating or drinking plants and water that accumulate large amounts of air pollutants.
(3) Harm to materials
Polluted air can corrode metals and building materials, accelerate the aging of rubber and plastic products, cause damage to handicrafts, etc.
(4) Impact on the atmosphere
Air pollutants can change the nature of the atmosphere and the pattern of climate. For example, carbon dioxide can absorb surface radiation and sunlight scattered by particulate matter, which can cause the Earth's temperature to rise or fall. Fine particles can reduce visibility, increase cloud cover and precipitation, increase the frequency of fog, and more.
What can we do for the environment?
1. Don’t smoke and don’t spit.
2. Turn on the air conditioner as little as possible
3. Try to walk or use non-polluting means of transportation
4. Plants can purify the air, so more trees and grass should be planted.
5. When cleaning streets or rooms, you should first sprinkle water before cleaning.
6. Do not burn straw and try to use anthracite for cooking and heating.
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