1、A Keynote Speech at the 2nd Symposium on Environmental PollutionRespected President,Ladies and Gentlemen,Its my great honor to make the keynote speech at this conference. Nowadays, PM2.5 has become an environmental problem we cant neglect any more. A recent research shows very high levels of PM2.5 i
2、n a broad swath stretching from the Saharan Desert in Northern Africa to Eastern Asia.PM2.5 refers to the atmosphere diameter less than or equal to the particles 2.5 microns. Although PM2.5 only group content of a few earth atmospheric composition points, but it has an important influence on air qua
3、lity and visibility, especially in winter. Besides, PM2.5, which has a small particle size, contains a lot of toxic and harmful substances. As a result, longtime exposure to PM2.5 which can go directly to the alveoli of the lungs, is a major health hazard. In fact, the American Heart Association est
4、imates that in the United States alone, PM2.5 air pollution spark some 60, 000 deaths a year.Recently, PM2.5 has influenced our life obviously. There are fog and hazy weather in big city from time to time, which even causes many protest haze activities in China. And many factors may contribute to it
5、. Firstly, the large amount of pollutant emission, including coal-fired pollution, motor vehicle emission, industrial pollution and dust is the root cause of serious air pollution. Secondly, the proliferation of adverse condition. The extreme adverse conditions for the spread of contamination is the
6、 direct cause of the formation of this contamination. Thirdly, regional pollution and the contribution of local pollution overlay.Due to the worse harms of PM2.5, it became the study object and chief pollutant for rigorous control in the world, especially in the developed countries, during recent ye
7、ars. But China does not build any PM2.5 control standard until now. In china, studies of PM2.5 are just underway, and the studies mainly focus on metropolises and seriously polluted cities.But the government of China has realize the problem. Chinese State Council passed revised air quality standards
8、 which include an index for PM2.5 on February 29, 2012. The new standards include indices for the concentration of PM2.5 and ozone (O3) over a period of eight hours.In 2012, the monitoring of PM2.5 and O3 will be conducted in four municipalities, 27 provincial capitals, as well as three key regions
9、- east Chinas Yangtze River Delta, south Chinas Pearl River Delta, and Beijing-Tianjin-Hebei area in the north. In 2013, the monitoring has been extended to 113 model cities on the state environmental protection list. In 2015, the monitoring will be extended to all cities at prefecture level or abov
10、e.So, its important for us to find a way to measure and reduce the level of PM2.5, which may help the government reach the goals. There are many ways to solve the problem. For example, many countries have been developing new energy to curb greenhouse gas emissions and fight climate change, while buzzwords such as clean energy, green energy and renewable energy receive much publicity.I believe we can surely control the air pollution in the future with the concerted efforts.Thank you!
