关于空气污染的英语作文(优秀20篇)

For most people, they will choose to travel during holiday because they

want to relieve themselves from the high pressure of work. However, it happens

quite often that people often ran into traffic jams on the way to travel. Some

people think that we can relax ourselves by traveling no matter of how many

people there.

Some people would rather to stay in home than going out to travel because

they think there are too many people swarm into the scenic spots. In my point of

view, I would rather to stay indoors rather than going out to travel. Reasons

are listed below.

空气污染是空气中某些物质的含量超过正常含量时，形成危害动、植物，影响其生存的现象。大气中C0、NH3、SO2、H2S、Cl2、03和N02等物质的正常含量均在百万分之一以下，对动、植物没有明显的不良影响。但19世纪以来，由于工业和交通运输的发展，那些物质大量排入大气，使空气污染日趋严重，影响到动、植物生命活动乃至人体健康。

污染物的来源，有的来自自然界（如火山喷出的烟灰），有的来自人类活动，其中工业、交通运输产生的废气是主要的污染源。空气污染可分为气体污染物和气溶胶状污染物两大类。气体污染物包括SO2，、03，、氮的氧化物以及碳氢化合物等；气溶胶污染物包括固体粒子（粉尘、烟尘气）和液体粒子（烟雾、雾气）两类。直接向空气中排放的污染物质，叫一次污染物。空气与污染物之间相互作用，产生反应，或空气中光化学反应引起的污染物变质所产生的新污染物，叫二次染物。

空气污染物种类很多，其中对农业威胁较大的约有十多种，如SO2、 HF、C12和光化学烟雾等。 气象条件对空气污染物的影响，水平风速和对流层高度是影响大气稀释空气污染物能力的两个气象要素。当农田上空主导风向来自污染源时，农田容易受有害气体的危害；风力强弱则影响空气污染物的扩散速度、污染物在空气中的浓度与平均风速成反比；通常午后湍流强，空气处于不稳定状态时，有利于扩散。夜间晴朗无风，近地面逆温层可使污染物在地面上停滞积聚，加剧空气污染的程度。另外，在准静止的高气压系统中，由于下沉逆温阻止下层排放的污染物扩散到大气上层，可形成近几百米厚的污染层。各国多次发生的严重空气污染事件大都是在低逆温层、风速小和无雨的气象条件出现几天之后形成的。

空气中一些污染物例，如SO2和悬浮于空气中的农药颗粒等，经雨水淋溶落到地面，又可污染土壤和植株。污染物对植物的危害，一般是通过气孔进入植物组织，干扰酶的作用，阻碍代谢机能，有的有毒物质在体内还可进一步分解或参与合成过程，产生新的有害物质，侵害细胞组织，抑制光合作用，使生长受阻、产量降低、品质变劣。其危害分为急性、慢性和不可见危害等。高浓度污染物造成急性伤害，引起产量显著下降，低浓度污染物，在长时间作用下，造成慢性危害，一般症状不明显。不可见危害只造成生理上的障碍，一般没有症状。

植物受空气污染危害的程度，主要受下列因素影响：污染物浓度和植物接触它的时间；植物本身的构造和所处的发育期以及环境条件的影响。如充足的光照，适宜的温度、良好的供水和空气湿润，较高的C02浓度等，都能导致叶片气孔开放，易受污染危害。 植物对大气的净化功能。不少植物具有一种以酶作催化剂的潜在解毒力，能够分解一些有毒物质，或形成一些大分子络合物，暂时可以降低毒性。1公顷森林，每年可吸滞灰尘30多吨，1公顷柳杉林，每年可吸收700多公斤S02，柑桔树的叶子可吸收储存硫达1％，青杨和桑树具有较强的吸收铅尘的能力，加拿大杨、银杏、榆树、梧桐、桉树等都是较好的“天然吸尘器”。草坪的吸附粉尘能力比裸露地面大几十倍。因此环境科学的任务之一，是要充分发挥植物净化大气的作用。选择吸收污染能力强的植物，扩大造林绿化面积，根据污染源位置、污染物汇集区的地形地势、风向和污染气体的季节分配，统一考虑构成一种包围式或隔离式的林带，使含尘气流在移动中途被树林吸收。另方面要研究采取控制或减少排放污染物的措施，以保证大气质量符合规定的标准。

It was Mother’s Day.Sun Zheng thought he should do something for

hismother.He decided to help his mother do some housework.After school he went

toa shop to buy some food on his way home.

When he got home, he did his best to cook some nice food,though he

couldn’tdo the cooking well.Thenhe cleaned the room.He felt very tired, but he

wasvery happy.

When his father and his mother came back and saw the clean rooms and

disheswhich weren’t so nice, they were very happy.They had their supper

together.Hismother said, "Thank you,my child!"

Today is womens day, and also the day I get the scholarship. Look! I made

a chocolate bar for my mother with a scholarship. Although I have paid a lot for

myself, I am very happy in my heart: I can also give my mother a gift, instead

of wrapping around my mother for presents!

But mom is sick and cant eat sweet food. I had to put the chocolate in the

fridge, but after a few days my mother was very ill, and she took a big bite,

and I eagerly asked, "is it good?" She said it was a little sandy. I took a

bite, too. I was a little depressed. But my mother encouraged me, "but its

sweet, its great!" My heart is sweet and happy! I wrote a few words

specifically for my mother, although it was not very good.

Dear Manager

I got to know the message that the position of the salesman in your company is empty, which made me excited about it, for that, I want it for a long time.

Please let me tell the reasons why I am so excited. Its so famous that it is hardly unknown to everyone. As known, in your company, the products are in a good qualification and the sales service is satisfied, which made me believe that your company would be a perfect stage for me.

Of course, the requirements for this position are high, but I think I am good enough for it. In the last four years, I worked very hard on my study and had a good understanding of professional knowledge. Besides, I took every chance to practice. I attended several activities and took up an internship is an organization. As a result, I developed great practical skills. And, I get CET-6 certification and choose the sales lessons. I think they would be helpful to be your staff.

I am looking forward to your reply.

With our world developing,more and more people neglect how to conduct

theirselves.What is the most common reflection of this phenomenon is

dishonesty,which is now seriously influencing relationship between people.

Being dishonest can do harm not only to others but also to

ourselves,thus,we must get aware of the importance of boycoting it.Take the case

of the Sanlu powder for example.After drinking Sanlu fake powder,lots of babies

got sick and had big heads,nevertheless,their bodies still thin.People hateful

too much,the Sanlu corporation expectedly get punished and never have choice to

make up their faults.

When it comes to the significances of being honest,I consider,we will make

good relationship bewteen others,such as in the school ,in the busineand in the

society.Furthermore,only if we are honest to others can others become friendly

to us.Therefore,cultivate a virtue of honesty and we will get better.

Nowadays, more and more people prefer to travel quite often. Bytraveling,

we not only can relax ourselves but also broaden our knowledge circles. From my

aspect, I think we can make many friends and travel with them.

Firstly, we can enjoy the beautiful scenery and relax ourselves. For modern

life, we are busy with our work with high pressure. However, when we travel, we

will be attracted by great landscape and forget pressure from both work and

life.

Secondly, we can make friends by traveling. For most travelers, they tend

to find many companions to travel with. If you check the internet, you will find

that some people will call others to join them for travel. Through this kind of

travel, we can meet many different people and make friends with them to broaden

our social circle.

Thirdly, we can learn much knowledge form travel. Before you go to

somewhere to travel, generally, you need to make plans for your travel. You can

find lots of things you don’t know when you make a plan, such as, the origin of

a certain area, the customs of different areas, local food and so on.

In conclusion, we can not only relax ourselves and make new friends but at

the same time we can learn much from travel.

The generation gap refers to the difference in attitude toward thing or the

lack of understanding between young people and older folks.

In families as well as in society, the young and the older may not agree

with each other on this and that from time to time. Young people would llke to

make as much money as they could and spend as much money as they could earn

while older folks are easily satisfied with what they earn and save as much as

possible. Young people llke the exciting and deafening pop music while older

folks prefer melodious folk-songs or classic music. A boy and a glrl today may

fall in love with each other as quick as lightning, while their parents or grand

parents might trudge over a long distance before they kissed each other and

became lovers when they were young.

However, we should not be amazed at the generation gap,for it is quite

natural in the development of society. The world is a changing world, in which

everything keeps changing, generations of human beings included. And changes

lead to progress.

“迎着朝阳，背着书包，我们来到了美丽的学校……”咦，这是什么声音？啊！再看东胜区第五小学的电动伸缩门缓缓地打开，走出来一队穿着整齐校服带着鲜艳的红领由的学生，打头的两个还举着一个红条幅，上面写着“绿色生态文明——”。哦！原来是五小学生要去植树呢，这其中还有我呢，和我们一起去看看吧。

走在去的路上，我背着画板，心情愉快极了，仿佛踩在了棉花糖上似的，飘飘然了。终于来到了目的地，这是在马路边的一个公园晨，公园晨到处都是树，为公园增添了一丝生机。这时，走过来一位植树管理员，他向我们介绍了公园的各种树木，有杨树、柳树……这么多种树，都看得我目不瑕接了。这时，管理员叔叔指着一棵树，对我们说：“大家说那是什么树？”我们异口同声地说：“假树！”管理员笑了起来，大家也笑了起来。

最难忘的是，我们也种下了一棵由自己亲手种的树。管理员带着我们找到铁锹，来到种树的地方，我用脚踩着锹面上方的梭，踩下一脚锹面深深的嵌进了土里，我又往上一跳，一堆土就被刨了出来，我又来一个“如法刨制”不一会儿，我们就挖好了一个土坑，接着，同学们又找来一根“光杆司令”——一棵没有枝叶的树，我们让它立的端端正正，让它“跳”入土坑，埋上了它的脚，然后给小树挂上我们自己做的环保标语，小树仿佛看到了我们送给它的礼物迎风摆动着几根小树枝，仿佛在说：“放心吧！”

我一定会好好成长的，最后，我们用画笔画下了初春的公园。呵！好美啊！

这次植树就在我们的恋恋不舍中结束了。以后我一定要多植树，让我们的城市真正变成绿色城市！

With the development of information industry, there are more and more

people shopping online. Shopping online means shopping on the Internet without

going out. Therefore, on the one hand, shopping online has its advantage. One

the other hand, shopping on line also has its disadvantage.

First of all, shopping online is very convenient. People can buy thing only

they have a computer, which can surf the Internet. They don’t need to go out on

a rainy day or under the shining sun. Meanwhile, people can save their time to

finish their work or other things. On the contrary, as people just decide what

they buy depending on the picture placed by the shop owner, they can’t see the

quality before they receive the product. Sometimes people maybe buy the things

are in low quality, or some fake products.

In general, shopping online has its advantage and disadvantage. In my

opinion, I prefer shopping online than shopping on the street.

Some think we should try to help strangers. Helping others is a virtue，and

helping others is helping ourselves.We may come across some trouble and need

others help some day.If everyone isnt willing to help us just because we are

strangers to them，its hard to imagine what our world will be like.However，some

are afraid that helping others can sometimes bring us trouble.Sometimes we are

just misunderstood and even have to pay the cost of kindness.In my opinion，we

should try our best to help others when they are in need of help，but we should

also protect ourselves from getting into trouble.If everyone tries a little

kindness，our world will be full of love.

Failure exists in every stage for everybody. As students, I think the most

common failure would be failing in the exam. Yes, I have failed in the exam for

many times. It is very common, because on one can keep the name of

ever-victorious generals forever. But some students do not figure out this. When

they fail in the exam, they need a long time to recover, even have directly

negative effect on their inner heart. This is not the right way to deal with

this problem. We need to figure out the reason why we don’t do well in the exam.

And then correct it. Try our best to get better next time.

In my family, there are only three people, my parents and I. because of my

parents’ work, they could only have one child at that time, so I don’t have any

siblings. I felt so lonely when my parents went out for their work. Now the

government changed their policy, people can have the second child. But some

people refuse because they think they can’t afford it. Despite the expense,

there are many advantages to have the second child. For one thing, the only

child can have someone company, so they won’t feel lonely on the process of

growing up. For another thing, two kids will help each other, they can share

things together. Learning to share things is a very important lesson for

children. In Chinese tradition, more kids, more better, but I think two are

perfect for the family.

Then, the representative of the bedroom Zhu Guozhang asked us to guess a

line of a poem related to the above situation. He added that Li Xinmin alone was

born in the year of the dog and the other three were all born in the year of the

chicken. They left us all in confusion. And it was our monitor who was

quickwitted. He shouted our, "The day breaks as the cock crows three times at

dawn." The hall After that, they had another item. This time Li Xinmin was

placed in the middle of the circle. While he was standing there, the other three

stood around him, each bowing down to him at an angle of 120 degrees. It was an

idiom. This time I got it right:"The dog stands out among a group of

chickens."

What a colorful world of the fall,this is a credit to the leaves,they have

red and green,the autumn dress up like a large garden.

Red maple leaves,like palms,just five piece children.Leaves a small number

of prominent teeth,the base of the heart-shaped,dark green to dark green above

to below the axillary vein has hair sense,the edge is also trimmed with lace

irregular.Bark grayish brown,with the old growth,the surface grooves and

scales.Maple leaves,autumn brings a festive and warm.

Holly tree is the symbol of vitality,crown thriving,flourish.Leaves

oval,pointed at both ends,like the two tilt of the boat.Stem and leaf surface

veins is very clear,long from bottom to top,from coarse to fine.The front of

dark green leaves,very smooth,negative light green,because there are many

prominent veins and coarse stems.Holly leaves have wavy lines on the edge of the

same jagged,but not scratchy.

The campus,red maple,holly green,a passionate,full of vitality,this is

really the mental outlook of our young pioneers it!I love autumn,I love the fall

on campus.

With the development of the e-commerce, more and more people intent to do

the shopping online. There are many advantages of online shopping, yet there are

some disadvantages too.

On the one hand, the online shopping are very convenient. Unlike the

physical stores, there is no limit of time for you to do the shopping online.

And you can find anything in the online store, some of which you may hardly buy

at the local. And also, the price is relatively transparent, you can choose the

affordable one to buy.

On the other hand, since the goods are only presented by the pictures and

descriptions, it is hard to tell its reality, so you might have bought something

you don’t like, or even the fake one. Of course you can ask for the after

service, but it will increase your cost of the time. And the advertisements on

the online shops may make you spend much more money on online shopping without

being conscious.

Anyway, the online shopping makes the shopping easier, but please do it

with rationality.

if you want to understand adversity, take two identical acorns from the same oak tree and plant them in two different locations. plant the first in the middle of a dense forest, and the other on a hill by itself.

要是你想理解什么是逆境，就去拿两颗从同一棵树上摘下来年龄相同的橡树果，并且把它们种到不同的地方。第一颗种在浓密的树林当中，而另外一颗则单独种在一座山上。

heres what will happen. the oak standing on a hillside is exposed to every storm and gale. as a result its roots plunge deep into the earth and spread in every direction, even wrapping themselves around giant boulders. at times it may seem the tree isnt growing fast enough—but the growth is happening underground. its as if the roots know they must ported the tree from the threatening elements.

事情的结果便是这样。那颗长在山上的橡树经历了大风大雨，结果它的根深深地扎进了泥土中间，并不断向四周扩张，甚至把自己置身于巨大的石块当中。有时它可能看起来长的不是很快，但这时它却在地下悄悄生长着，好像它的根知道自己必须快速生长来保护树木免受自然危害的影响。

Honesty is long-lasting virtue of people all over the world. Likewise, it

is also one of the deeply-held values of the Chinese people. Some people believe

that in the market economy, honesty tends to be obsolete. In my opinion, honesty

will never be out of date no matter what the situation might be.

Firstly, honesty has been treasured and honest people have been respected

through history in all parts of the world. People everywhere would regarded

honesty as a virtue and hate a dishonesty person. Secondly, honesty is the basis

of interactions among people. People should treat each other sincerely and open

their hearts to each other. Only in this way can the relationship among the

people be natural. Thirdly, in the market economy, some people try to get more

money at the cost of honesty. To them, a best businessman is one who can cheat

most tactfully. Even in this kind of society, honesty is deeply valued by most

people.

We can see that not only in history, but also at the present day, honesty

was and is valued by the majority of the people and the virtue will not perish

so easily.

Nowadays,with the rapid development of our society,almost all the graduates

have to face a choice:to get a job first or to find the job you like first?As

far as I am concerned,the graduates should get a job first and then choose the

job they like.The reasons can be listed as follows:

First of all,for many students,even they themselves don’t know what kind of

job they want to choose.For these students,to get a job first can help them find

out their favorite job through trying different work.What’s more,the graduates

are all under great employment pressure.There are thousands of graduates need to

find their jobs every year.So if the graduates don’t get their jobs as soon as

they leave the school,they will miss the best chance to get a job.Last but not

least,one can accumulate experience and broaden horizons in his or her first

job.It’s certain that these experiences will contribute to future job.As the

famous saying goes “One should apply theory to practice.”,students should apply

what they have learned in class to their jobs,thus enhancing their working

skills.

Above all,nowadays under the greater employment pressure,the graduates

should get a job first and then to choose the job they like.Since students can

have a better understanding of what they like and gain experience in the first

job.

Campus activities have been organized in many universities and colleges.

These activities range from academic to recreational， such as academic reports，

social consulting services， speech contests， poet’s club， painting clubs，

singing and dancing groups， etc.

These activities provide students with two major advantages. First of all，

they play a positive role in improving students’ studies. Due to their heavy

schedules， students are often busy themselves with textbooks and seldom expose

themselves to a colorful life. But the variety of the activities provides

opportunities for them to relax themselves and enrich their minds and knowledge.

In addition， the activities also serve students living in the “ivory tower” have

little chance to get in touch with society. Now the activities open the door for

participants to leave their classrooms and get to know society.

All this offers an important means for students to broaden their horizons.

They believe with the right kind of guidance and help campus activities will

continue to grow and flourish.

I,m so glad to receive your letter, in which you wanted to know about the

Dragon Boat Festival in China.

I feel honored to tell you about it. Celebrated on May 5th in the lunar

calendar, it is a folk festival having a history of more than two thousand

years. Also, it is one of the most important festivals in China.

As for the origin of the Dragon Boat Festival, there are many beautiful

legends, of which the story about Qu Yuan is most widely accepted. Qu Yuan, a

Chinese poet who loved his country deeply, drowned himself in the Miluo River

after his country’s being defeated. To honor him, people in China hold various

activities every year, including eating zongzi and dragon boat racing.

I hope you can come to China to enjoy it for yourself.