If I were pm2.5, a 500-word essay

PM2.5 refers to particulate matter in the atmosphere with a diameter less than or equal to 2.5 microns, also known as particulate matter that can enter the lungs. Although PM2.5 is only a small component of the earth’s atmosphere, it has It has an important impact on air quality and visibility. PM2.5 has a small particle size, is rich in toxic and harmful substances, stays in the atmosphere for a long time, and is transported over long distances, so it has a greater impact on human health and atmospheric environment quality. .In February 2012, the State Council agreed to release the newly revised "Ambient Air Quality Standards" and added PM2.5 monitoring indicators. On September 9, 2012, the Beijing Municipal Environmental Protection Bureau Monitoring Center stated that the new version of the air quality release platform will be released in January 2012. It will go online on October 1. The Beijing Environmental Monitoring Center Station stated that Beijing is expected to include PM2.5 in the new air quality evaluation system from October 2012.

Concept: PM, the full English name is particulate matter. Scientists use PM2.5 to represent the content of such particles per cubic meter of air. The higher the value, the more serious the air pollution. The inhalable particulate matter and total suspended particulate matter in the daily or weekly urban air quality reports are more familiar to people. Two types of air pollutants. Inhalable particulate matter, also known as PM10, refers to particles with a diameter greater than 2.5 microns and equal to or less than 10 microns, which can enter the human respiratory system; total suspended particulate matter, also known as PM100, refers to particles with a diameter less than or equal to 100 microns. of particulate matter.

Source: The main source of PM2.5 is the residue emitted by combustion during daily power generation, industrial production, automobile exhaust emissions, etc. Most of them contain toxic substances such as heavy metals. Generally speaking, Generally speaking, coarse particulate matter with a particle size of 2.5 microns to 10 microns mainly comes from road dust, etc.; fine particulate matter (PM2.5) below 2.5 microns mainly comes from the combustion of fossil fuels (such as motor vehicle exhaust, coal burning), volatile organic compounds, etc. .

Health damage: Meteorological experts and medical experts believe that haze weather caused by fine particulate matter is even more harmful to human health than sandstorms. Particles with a particle size of 10 microns or more will be blocked by Outside the human nose; particles with a particle size between 2.5 microns and 10 microns can enter the upper respiratory tract, but some of them can be excreted through sputum, etc., and they will also be blocked by the villi inside the nasal cavity, which poses relatively little harm to human health. ; Fine particles with a particle size of less than 2.5 microns are equivalent to 1/10 the size of human hair and are not easily blocked. After being inhaled into the human body, they will directly enter the bronchial tubes, interfere with the gas exchange in the lungs, and cause asthma, bronchitis and Cardiovascular diseases and other diseases.

On average, each person inhales about 10,000 liters of air every day. The fine dust entering the alveoli can be quickly absorbed and directly enter the blood circulation and be distributed throughout the body without going through liver detoxification; Secondly, it will damage the ability of hemoglobin to transport oxygen and cause loss of blood. For patients with anemia and blood circulation disorders, it may have serious consequences. For example, it can aggravate respiratory diseases and even cause heart diseases such as congestive heart failure and coronary artery. In short These particles can also enter the blood through the bronchi and alveoli, and the harmful gases and heavy metals in them are dissolved in the blood, causing greater harm to human health. The physiological structure of the human body determines that it has no ability to filter or block PM2.5, while PM2 .5 The harm to human health has gradually been exposed with the advancement of medical technology.

Research by Wei Fusheng, academician of the Chinese Academy of Engineering and former chief engineer of the China Environmental Monitoring Station The results also show that the higher the concentration of PM2.5 and PM10, the higher the incidence of respiratory diseases in children and their parents, and the impact of PM2.5 is particularly significant.

Prevention and control measures: Since pm2.5 The main source of PM2.5 is the emission of motor vehicle exhaust. Once the main reason is found, it is easy for individuals to find ways to deal with it. The main effective method is to wear a real anti-PM2.5 mask. Especially on the way to and from work. In subway stations and places with high crowd density, PM2.5 masks can not only prevent dust and PM2.5, but also use polyconon fiber that can kill "super bacteria" that even antibiotics cannot kill. People are constantly moving around. In the breath, PM2.5 particles are mixed with a large number of pathogenic bacteria and are inhaled by people, which directly harms human health. Using a mask is undoubtedly an effective solution to the problem of dust prevention and disease prevention. (Tip (don’t forget to travel) America of Tmall

Imported Puweixin)

Try to reduce smoking or even not smoke. There is a large amount of pm2.5 in the smoke, which will cause direct and indirect harm to the human body. If you cannot prevent people around you from smoking, you should try to stay away Smog. Morning exercise is not allowed in heavy fog. PM2.5 is one of the important culprits of foggy weather. Therefore, when you find that the fog is relatively heavy in the morning, it is not appropriate to go out for morning exercise. If you must do morning exercise, it is recommended to wear something that can truly prevent PM2. 5 masks for morning exercises such as jogging and trotting.

Governance plan: It is necessary to adopt a unified rather than separate response strategy to air pollution and climate change. Since air pollution and climate change are closely related to each other, There is a reason for this, that is, it is mainly caused by emissions from fossil fuel combustion. Therefore, the actions to reduce and control air pollution and reduce greenhouse gas emissions to protect the climate should be consistent. Some studies have pointed out that the increase in atmospheric aerosols reduces The amount of solar radiation reaching the ground is opposite to the warming effect of greenhouse gases and cancel each other out. 50% of the surface warming caused by greenhouse gases may be offset by the cooling effect of aerosols. Once the aerosols are removed, the The warming caused by greenhouse gases is more significant, which will further increase the pressure to reduce CO2 emissions. Therefore, the two problems of air quality and climate change cannot be solved in isolation. They are closely coupled together. In the face of pm2.5, we What should be done?

Question 1: Respirable particulate matter in the air with a diameter of less than 2.5 microns.

(2 points) Question 2: (1) PM2.5 carries chemical substances and viruses into various blood vessels of the human body, causing damage to human body organs (2) Leading to haze weather (4 points, 2 points for each point) Question 3: No, (1 point) "part" plays a limiting role, accurately indicating that not all PMl0 is excreted from the body. If it is removed, it will appear unrealistic, which reflects the accuracy of the explanatory language. .

(2 points) Question 4: Points will be given if the statement makes sense (2 points for each item, ***4 points) Examples: (1) Try to walk or take the bus when going out; (2) ) Use clean energy and reduce alkali emissions.

Wait.

Question 1: Analysis of the test question: Read the first paragraph carefully and summarize the key words "suspended particles in the air", "diameter" and "below 2.5 microns".

Question 2: Question analysis: Read the last three paragraphs, grasp the key sentences, and summarize them from the two aspects of harm to the human body and impact on the weather.

Question 3: Question analysis: Compare and analyze whether there are any changes in the semantic meaning of this word, so as to explain the role of this word. To summarize from the perspective of the accuracy of the expository language, use the evaluative word "accurate explanation" .

Question 4: Question analysis: Understand the causes of "smog" based on the content in this article, and imagine measures to solve the problem from the perspective of eliminating the sources of "suspended particles".

Looking for an environmental protection English composition about PM2.5,

Recently the problem of protecting the environment has been brought into focus. With the rapid development of economy, the surroundings of us bee severe. Nowadays PM2.5 and other problems has bee a problem we have to see. As is known to us that once the balance in nature is disturbed, it can lead to unpredictable results. Many factors that contribute to it. Firstly, merchants only pay attention to profit. So we should protect the environment and coordinated economic development. Secondly, the cars in China increasingly raise. We all know off gas can pollute air deeply. So we should suggest people that go to work by bike or bus. Thirdly, wasting water and excessively cutting down trees is increasingly mon. I think we should suppose environmental protection knowledge. We should spare no effort to protect our environment. Only in this way can we solve pollution problems. I believe nothing in the world is difficult for one who sets the mind to it. I am asking for a college entrance examination English composition about air protection PM2, about 5.120 words, and I am asked to mention PM2.5 and write...

Recently the problem of protecting the environment has been brought into focus. With the rapid development of economy, the surroundings of us bee severe. Nowadays PM2.5 and other problems has bee a problem we have to see. As is known to us that once the balance in nature is disturbed, it can lead to unpredictable results. Many factors that contribute to it. Firstly, merchants only pay attention to profit. So we should protect the environment and coordinated e

conomic development. Secondly, the cars in China increasingly raise. We all know off gas can pollute air deeply. So we should suggest people that go to work by bike or bus. Thirdly, wasting water and excessively cutting down trees is increasingly mon. I think we should suppose environmental protection knowledge. We should spare no effort to protect our environment. Only in this way can we solve pollution problems. I believe nothing in the world is difficult for one who sets the mind to it. About pm2.5 All information

PM, the full English name is particulate matter.

Scientists use PM2.5 to represent the content of such particles per cubic meter of air. The higher the value, the more serious the air pollution.

Respirable particulate matter and total suspended particulate matter in urban air quality daily or weekly reports are two types of air pollutants that people are more familiar with.

Respirable particulate matter, also known as PM10, refers to particulate matter with a diameter greater than 2.5 microns and equal to or less than 10 microns, which can enter the human respiratory system; total suspended particulate matter is also called PM100, which refers to particles with a diameter less than or equal to 100 microns. Micron particles.

The main source of PM2.5 is the residue emitted by combustion in daily power generation, industrial production, automobile exhaust emissions and other processes, most of which contain toxic substances such as heavy metals.

Generally speaking, coarse particulate matter with a particle size of 2.5 microns to 10 microns mainly comes from road dust; fine particulate matter (PM2.5) below 2.5 microns mainly comes from the combustion of fossil fuels (such as motor vehicle exhaust , coal burning), volatile organic compounds, etc.

Meteorological experts and medical experts believe that haze weather caused by fine particulate matter is even more harmful to human health than sandstorms.

Particles with a particle size of 10 microns or more will be blocked from the human nose; particles with a particle size between 2.5 microns and 10 microns can enter the upper respiratory tract, but some can be excreted through sputum, etc. Outside the body, it will also be blocked by the villi inside the nasal cavity, which poses relatively little harm to human health; while fine particles with a particle size of less than 2.5 microns, which is equivalent to 1/10 the size of a human hair, are not easily blocked.

After being inhaled into the human body, it will directly enter the bronchus, interfere with the gas exchange in the lungs, and cause diseases including asthma, bronchitis, and cardiovascular disease.

On average, each person inhales about 10,000 liters of air every day. The fine dust entering the alveoli can be quickly absorbed and directly enter the blood circulation and be distributed throughout the body without going through the liver detoxification. Secondly, it will damage the hemoglobin's ability to transport oxygen. Ability, loss of blood.

For patients with anemia and blood circulation disorders, serious consequences may occur.

For example, it can aggravate respiratory diseases and even cause heart diseases such as congestive heart failure and coronary artery disease.

In short, these particles can also enter the blood through the bronchi and alveoli, and the harmful gases and heavy metals in them are dissolved in the blood, causing greater harm to human health.

The physiological structure of the human body determines that it has no ability to filter or block PM2.5. However, the harm of PM2.5 to human health has gradually exposed its terrifying side with the advancement of medical technology.

In EU countries, PM2.5 reduces people’s average life span by 8.6 months.

PM2.5 can also become a carrier of viruses and bacteria, contributing to the spread of respiratory infectious diseases.

At present, major developed countries in the world as well as Japan, Thailand, India, etc. in Asia have included PM2.5 in air quality standards.

The most tragic thing is that PM2.5 has not yet been included in my country’s ambient air quality indicators, so this has become the root cause of the direct conflict between the US Embassy data and the official Japanese data.

The World Health Organization also pointed out in the 2005 version of the "Air Quality Guidelines" that when the annual average concentration of PM2.5 reaches 35 micrograms per cubic meter, the risk of death for humans is about 10 micrograms per cubic meter. Increase by 15%.

A report from the United Nations Environment Program stated that if the concentration of PM2.5 increased by 20 mg per cubic meter, about 340,000 people would die in China and India every year.

Edit this paragraph Monitoring situation The PM2.5 standard was proposed by the United States in 1997, mainly to more effectively monitor the PM2.5 that emerged with the increasing development of industrialization and was included in the old standard. Neglected fine particles that are harmful to the human body.

The PM2.5 index has become an important index for measuring and controlling air pollution levels.

As of the end of 2010, except for the United States and some EU countries that have included PM2.5 in national standards and imposed mandatory restrictions, most countries in the world have not yet carried out monitoring of PM2.5, and most of them have adopted PM10 is monitored.

The World Health Organization (WHO) believes that PM2.5 less than 10 is a safe value, and these areas in China are all above 50 and close to 80, which is much higher than the Sahara Desert.

[1] Monitoring and comparison: On December 5, 2011, heavy fog occurred in northern my country, with visibility less than one kilometer, causing the closure of highways between several provinces and the delay of more than 300 flights into Beijing. or cancel.

Citizens traveling in heavy fog. The U.S. Embassy in China released PM2.5 monitoring data every hour. The data showed that at 19:00 pm on December 4, 2011, the U.S. Embassy in China monitored PM2.5 in Beijing. The PM2.5 concentration is 522, the air quality index (AQI) is 500, and the health reminder is "Beyond Index". Since the highest value in the AQI announced by the US Embassy is only 500, many netizens exclaimed " Exploding again."

On December 5, 2011, the public comment period for the "Ambient Air Quality Standards" (second draft for comments) ended.

The draft proposes to add PM2.5 annual average and daily average concentration limits and ozone 8-hour concentration limits to the basic monitoring items. The new standards are planned to be fully implemented in 2016.

In the draft for comments on the "Standards", the PM2.5 annual and 24-hour average concentration limits are set at 0.035 mg/cubic meter and 0.075 mg/cubic meter respectively, transitioning from the World Health Organization (WHO) The target values ??for Phase 1 are the same.

The person in charge of the Department of Science and Technology Standards of the Ministry of Environmental Protection introduced that the "Ambient Air Quality Standards" (second draft for comments) mainly have three breakthroughs: First, the classification scheme of functional areas of ambient air quality is adjusted, and the current standards are The third-category area was merged into the second-category area; the second is to improve pollutant items and monitoring specifications, including adding PM2.5 annual average and daily average concentration limits and ozone 8-hour concentration limits to the basic monitoring items, tightening PM10 and NO2 concentration limits, etc.; the third is to improve the statistical validity requirements of data.

This is the first time that my country has formulated national environmental quality standards for PM2.5.

Experts said that PM2.5 is a pollutant that seriously harms human health and has been scientifically proven. In recent years, my country's PM2.5 pollution problem has become increasingly prominent.

Putting PM2.5 into the mandatory pollutant monitoring scope will help eliminate or alleviate the phenomenon that the public’s self-perception is not completely consistent with the monitoring and evaluation results.

Set the annual and 24-hour average concentration limits of PM2.5 at 0.035 mg/cubic meter and 0.075 mg/cubic meter respectively, which are the same as the target values ??in the first stage of the WHO transition period and are in line with my country's current economic development stage and environmental management needs.

In addition... In the era of PM2.5, how should we "strengthen ourselves and not suck"?

PM2.5 is particulate matter with a diameter less than 2.5 microns.

Generally, particles larger than 10 microns will be blocked from the respiratory tract by nose hairs and will not cause harm to the human body.

Particles smaller than 10 will enter the respiratory tract, deposit in the respiratory tract, and even cause pulmonary heart disease.

What is particularly noteworthy is that PM2.5 particulate matter can penetrate deep into the alveoli and cannot be expelled from the body with coughing. Instead, it will enter the human cardiovascular system, causing more serious harm over time.

Outdoors, including industrial emissions, tail gas emissions, indoor second-hand smoke and cooking fumes will produce pm2.5. Therefore, we must start from the small environment around us and improve the air quality around us, so that we can maintain healthy.

The current effective method is to use negative ion technology, which can effectively improve the phenomenon of high PM2.5 particulate matter in the surrounding area.

However, when choosing a product, you must choose a trustworthy brand. In terms of technology, it must not produce positive ions, radiation, static electricity, ozone and other harmful substances. Otherwise, the air will not be improved, but will be harmful to the air. The human body causes greater harm. There has been an incident involving PM2.5 recently. Can you tell me what you think? Interview questions, urgent.

PM2.5 refers to particulate matter in the atmosphere with a diameter less than or equal to 2.5 microns, also known as particulate matter that can enter the lungs (no standard Chinese name yet).

Although PM2.5 is only a small component of the earth's atmosphere, it has an important impact on air quality and visibility.

PM2.5 particles are small in size, rich in toxic and harmful substances, stay in the atmosphere for a long time, and are transported over long distances. Therefore, they have a greater impact on human health and the quality of the atmospheric environment.

A special reminder, PM2.5 masks are ineffective because the diameter of the particles is too small, and only gas masks can effectively protect them. A 200-word essay on smog investigation

Looking out the window, I suddenly found that there was no blue sky or white clouds in sight. The sky and the earth were a gray scene. Even the buildings opposite had only hazy outlines. Weather like this is getting worse and worse. More and more frequently, smog is silently shrouding our cities. Smog is a turbid phenomenon caused by a large amount of smoke, dust and other particles suspended in the fog. According to the remote sensing satellite monitoring of the Ministry of Environmental Protection: On January 29, within China An area of ??1.3 million square kilometers is shrouded in haze, and the air quality is seriously polluted. So how did the haze weather come about? Many families own cars, which makes our travel more convenient, but the exhaust emissions of cars pollute the air; power plants, refineries, and chemical plants "display their talents" in our cities, but they continue to emit soot and dust day and night; gorgeous The fireworks and firecrackers are dizzying, but the air is filled with smoke and becomes very turbid, the air quality drops sharply, and the PM2.5 and PM10 indexes rise linearly. These are the main causes of haze. They are bringing us quick convenience, While it is pleasing to the eye, it also quietly brings us unexpected consequences. In hazy weather, we breathe turbid gas. The haze in the air can cause pneumonia, pharyngitis, tracheitis, heart failure and other diseases. In 1952 The heavy fog in London, England, was like an invisible killer. It claimed the lives of 4,000 people in just five days, and 8,000 people in the next two months. It shows the power of the fog, and it should also be punished. We have sounded the alarm. What we want is fresh air and a healthy body. Please do not sacrifice your health in exchange for the so-called good life. Drive less, travel green, plant more trees, and protect the forest. Fighting haze starts with me. Tmall America's Puweixin reminds: Remember to take precautions when traveling in haze weather. Why should individuals monitor PM2.5 and what is its significance?

First, there are currently a small number of official environmental monitoring stations in our country. The highest and lowest PM2.5 values ??published by each monitoring station in the same city at the same time can differ by more than ten times. These values ??can only reflect the official environment. The air quality in the surrounding areas of the monitoring station, and the air quality in various micro-environments other than these areas, has little to do with these data.

Only when more individuals participate, measure the PM2.5 values ????in their places of residence and work and upload them to the public platform, can the urban micro-environment, such as a certain road, a certain The accurate PM2.5 value of each community is reflected.

Second, as Feng Yongfeng, the head of Darwen Natural Knowledge Society, pointed out, private monitoring can influence and motivate many people to participate, thereby forming an atmosphere in which "everyone cares about environmental protection and everyone loves environmental protection"; Third, personal monitoring can have a counterproductive effect on official monitoring, prompting official monitoring indicators to be announced as soon as possible and measures to reduce PM2.5 in the air.

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Don’t set off fireworks and firecrackers, give me a clear blue sky. The new year is here again. On New Year’s Eve, we will hear the deafening sound of firecrackers, but Setting off fireworks and firecrackers will cause various harms to us and affect various aspects of our lives. Although setting off fireworks and firecrackers is a happy thing, it can also cause huge harm. First of all, the carbon dioxide and metal particles produced by fireworks and firecrackers , and other substances will cause the air pollution index to seriously exceed the standard. If people breathe such polluted air for a long time, diseases such as bronchitis, pneumonia, emphysema, etc. will occur. In addition, some large firecrackers and large fireworks will make huge noises. It will damage people's physical and mental health. It will especially cause great harm to some elderly people suffering from old blood clots, coronary heart disease, and other heart diseases. It may even threaten the lives of these patients. The setting off of fireworks and firecrackers will increase the air pollution index. Reaching PM2.5. It is said that in 2012, as the temperature dropped in winter, more and more people used briquette stoves for heating. At that time, the air pollution index exceeded the standard, and the National Meteorological Administration issued a yellow warning for haze weather. In Beijing, Shanghai, and other densely populated and economically developed places in China have the highest pollution index. The China Meteorological Administration conducted an air index test in a place where fireworks and firecrackers are intensively set off, and the results were off the charts, with the measured air pollution index being 2,500. . It can be seen how great the impact of fireworks and firecrackers is on the air. Setting off fireworks and firecrackers will also cause huge economic losses and is a huge waste of social resources. Setting off firecrackers can cause casualties and cause fires. According to statistics, the number of people injured due to setting off firecrackers in Beijing in 2005 reached 551. There were 5 deaths and 378 fires. Although the number of safety accidents caused by setting off fireworks and firecrackers in Beijing is declining, we must also take precautions and resolutely resist setting off fireworks and firecrackers. Therefore, we should not set off fireworks and firecrackers because they The harm it brings to us cannot be underestimated. If we continue to set off fireworks and firecrackers, it will cause irreparable consequences. Therefore, from now on, we should not set off fireworks and firecrackers. In this way, we can have a safe and comfortable living environment. There is a clear blue sky.

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