Essay代写：Air quality and air pollution－r51due

下面为大家整理一篇优秀的essay代写范文- Air quality and air pollution，供大家参考学习，这篇论文讨论了空气质量与空气污染。随着工业及交通运输业的不断发展，大量的有害物质被排放到空气中，改变了空气的正常组成，使空气质量变坏，人类的健康受到严重的威胁。而空气污染指数指的是将常规监测的几种空气污染物浓度简化成为单一的概念性指数值形式，并分级表征空气污染程度和空气质量状况。空气污染指数关注的是吸入受到污染的空气以后几小时或几天内人体健康可能受到的影响。

With the progress of science and technology and the development of economy, people's living standards have been improving day by day. Air pollution has become a hot issue of increasing concern to the people. In recent years, the frequent occurrence of haze has brought great harm to people's life and health. People are longing for the blue sky and white clouds, looking forward to clean air......

Air is the gas that surrounds the earth and sustains both human and biological life. The clean air is made up of gases such as nitrogen 78.06%, oxygen 20.95% and argon 0.93%. These three gases account for about 99.94% of the total air, while other gases account for less than one thousandth of the total. However, with the continuous development of industry and transportation industry, a large amount of harmful substances are discharged into the air, which changes the normal composition of the air and makes the air quality worse, and human health will be affected. In order to improve environmental air quality, prevent ecological damage, create a clean and appropriate environment and protect human health, environmental air quality standards have been formulated in accordance with the environmental protection law of the People's Republic of China and the air pollution prevention and control law of the People's Republic of China. This standard provides for the division of environmental air quality functional areas, standard classification, major pollutant items and concentration limits of these pollutants at various levels, which is the scientific basis for evaluating air quality. It will related area according to the function is divided into three kinds of regions: a region for nature reserves, forest, scenic spot and other need special protection areas, the second area is confirmed in the town planning of residential area, commercial traffic mixed area, cultural area, general industry and rural areas, three kinds of area for a particular industry. Environmental air quality standards are also divided into three levels, one level of regional execution, two levels of regional execution, and three levels of regional execution. To measure the air quality of a certain region to reach several standards is to see the concentration of various pollutants in the air, such as total suspended particulate matter, sulfur dioxide, nitrogen oxides, etc. to reach several standards.

Atmospheric pollution usually refers to the phenomenon that some substances enter the atmosphere due to human activities or natural processes, present enough concentration and reach enough time, and thus endanger human comfort, health and environmental pollution.

Atmospheric pollutants are mainly divided into harmful gases and particulate matter. Their main sources are factory emissions, automobile exhaust, agricultural reclamation, forest fires, smoke, dust and so on.

Air pollution index is to regular monitoring of several kinds of air pollutant concentrations are simplified into a single conceptual index value form, and characterization of air pollution and air quality condition, suitable for said the city's short-term air quality status and changing trend, a group of Numbers is to assess the air quality, it can tell you today or tomorrow the air you breathe is clean and polluted, and you should pay attention to health problems. The API focuses on possible health effects in the hours or days after inhaling contaminated air.

The forecast of air pollution index can remind the public, especially those who are sensitive to air pollution, such as those with heart disease or respiratory problems, to take preventive measures when necessary before serious air pollution occurs.

Routine monitoring of air pollution is an important indicator of air pollution. At present, routine monitoring projects include sulfur dioxide, total suspended particles, nitrogen oxides, carbon monoxide and photochemical oxidants. Dust, total hydrocarbon, lead and fluoride are also monitored in some cities or industrial areas. The new PM2.5 in the newly revised environmental air quality standards is a routine monitoring indicator. Due to the strong scattering capacity of PM2.5 to visible light, which affects visibility, PM2.5 is one of the main factors leading to haze occurrence. PM2.5 particles are small enough to penetrate deep into the respiratory tract, and their possible effects include irritation of the respiratory tract, coughing, dyspnea, reduced lung function, worsening asthma, chronic bronchitis and triggering heart disease.

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