国际学术交流英语_讲稿以及问答_PM2.5_学术交流英语演讲稿

国际学术交流英语_讲稿以及问答_PM2.5由刀豆文库小编整理，希望给你工作、学习、生活带来方便，猜你可能喜欢“学术交流英语演讲稿”。

Morning ladies and gentlemen，it is a great honor for me to be here to do my presentation, today I want to say something about air pollution-PM2.5.As the beginning of my presentation, I’ll show several pictures of foggy cities.Can you gue where is this picture taken from? Yes, it’s the Oriental Pearl in Shanghai.And this place is the Palace Museum in Beijing.This picture is no better than the former two.Ok, let’s come back to my theme.There’re four parts in my presentation.First I will introduce something of PM2.5.Then I’ll tell you how PM2.5 does harm to us, and what we can do to protect us from it.The last but the most important is what we need do to control the pollution.Do you know how small the PM2.5 is? Look at this picture, this is the fine beach sand, its diameter is about 90 micrometers, this is a piece of human hair, the blue ball is PM10, and the red ball is PM2.5.From the picture, we can draw the conclusion that, the diameter of PM10 is one fifth of hair’s, PM2.5 is one forth of PM10, then you can imagine how small the PM2.5 is.So scientists usually use PM2.5 to show the content of particulate in per cubic meter of air.The higher the index is, the more harmful to people.This map shows the PM2.5 all over the world, on the map, the heaviest polluted areas are located in the northeast part of China.If you want to know more about the details, look at this map.Unfortunately, Jinan is listed as one of the heaviest polluted cities in China.Then where is PM2.5 from? I think there are 4 main resources. Daily power generation  Industrial production  Automotive exhaust emiion  Dust on the construction sites How does PM2.5 dose harm to us? It does harm to our respiratory system and cardiovascular system.If you are exposed in high density of PM2.5, that may cause DNA damage and increase the risk of lung cancer.So when it comes to protection, we should wear PM2.5 mouth-muffle, chooses public transport, smoke le or don’t smoke, and don’t exercise in fog day morning.To reduce the density of PM2.5, the fundamental measures are as follows:  Control the pollution source  Planting  Using the monitoring network  Setting spray equipment

I hope that in 10 years,20 years, our sky will be like this.Thank you for your attention~

Q：如果没有人为的空气污染，那么在空气中的PM2.5浓度是多少啊 If there is no pollution, what is the concentration of PM2.5 A：即使没有人为污染，空气中也有一定浓度的PM2.5.这个浓度称为背景浓度。大约是3-5微克每立方米

Even if there is no man-made pollution, also have a certain density of PM2.5 in the air.The concentration is called background。It is about 3 to 5 milligrams per cubic meter

Q: 从我们的专业角度讲，我们能做什么？对于一些大城市出现的汽车限购政策，你认为是一个好的措施吗？

From the point of view of profeional,what can we do for the pm2.5 problem？Do you think the restriction policy

of automobile in many cities is a good measure？

A：从一定程度上可以减少排放量，是一个措施，但不一定是适合所有城市。

We should develop advanced engine technology and after treatment technique to reduce the pm2.5 emiion.Q：Distinguished Profeor Li, do you think we can control the pm2.5 pollution succefully? A: No Q：so what is the significance of the control of pm2.5? A:actually it is impoible in china，just as the horizon, you can see it, but you can never get it.Q:so did you mean the control of pm2.5 is just of more psychological importance? A: yes, i did