The experts talk about PM2.5 in China the situation said that North China the most heavily polluted

■ Yesterday, the China Environmental scientific research, vice president of Chai Development and Cooperation in Guangzhou talks. New Express reporter Ning Biao/photo

■ Express reporter Levin intern Meng –

Cai of

Environmental Sciences Associate Dean of Development and Cooperation in the ear do lectures is recommended:

Yesterday, the vice president of China Environmental Science Research Chai Development and Cooperation of Guangzhou City Environmental Protection Bureau’s invitation for the environmental protection system, a lecture. He introduced a number of world-wide, China, the Pearl River Delta PM2.5 special findings, Guangzhou, said China Southern PM2.5 overall concentration is lower than the north, but the humidity, the more the formation of haze, it is recommended to take the heavy pollution weather special measures to cope up control of the PM2.5 pollution from pollution sources.

Q1: PM2.5 health effects? A: respiratory diseases increased significantly

of PM2.5 in a very big impact on human health, the international community has done a lot of research, our country has undertaken a number of studies. Cause heart vascular disease and respiratory diseases. “Cai Development and Cooperation, said the international study estimated that the European average life expectancy of 8.6 months due to loss of PM2.5 each. He said that although the lower PM2.5 concentration in Guangzhou, Guangzhou, PM2.5 concentration for each additional 10 units, and lead to cardiovascular, respiratory diseases has significantly increased.

Q2: What height PM2.5 pollution is the most important? A: Shijiazhuang 160 meters to 170 meters

Cai CDCC also describes the results of the one in Shijiazhuang City, Hebei. Research institutions in a building within the city to set the gradient type of inspection station equipped with testing instruments at different altitudes. Follow-up study of PM2.5 in the highest concentrations in the 160-170 m, instead of people always thought that near the surface.

The results of this study and the different geographical topography, climatic conditions have a relationship, the conclusions are not applicable elsewhere. “Cai CDCC warned.

Q3: China PM2.5 pollution, focusing on what? A: North China, eastern region

Chai Development and Cooperation, World Health Organization has evaluation of PM2.5 pollution in 1100 cities around the world, to count, Beijing, Shanghai, Guangzhou, China’s three cities, including China was ranked between 812-1058, “so our country in the world PM2.5 pollution is heaviest.

in China, the most serious of PM2.5 in the degree of pollution is mainly in North China, the eastern region, not in the PRD, “according to the detection of four months PM2.5 demonstration in northern China, the South concentrations are very high, but apparently the north than the south is much higher “.

Guangzhou, how? Cai Development and Cooperation, the PM2.5 concentration in Guangzhou from 2007 to 2010, is a downward trend, but the decline is not very large, in which extremely high concentrations of 2009, is a jump.

Q4: Guangzhou haze Why is it serious? A: Southern humidity

northern China PM2.5 concentration than in the south, but its nature, and Haze in the relationship and the South very different. Cai CDCC introduced PM2.5 unlike sulfur dioxide, nitrogen oxide is a substance, but the combination of substances, the nature of the different parts of the PM2.5 is completely the same. In the north, the dust impact on PM2.5 is relatively large; the South, especially the Pearl River Delta region, sulfate, nitrate, and organic pollutants, organic pollutants in the proportion is much larger than the North.

“I really think that the PM2.5 is not very high in Guangzhou, but the haze in Guangzhou is very serious, why is this?” Cai CDCC explained, due to humidity differences in the North and the South, much of the PM2.5 concentration cause haze, but also very different, get visibility of 10 meters, PM2.5 at about 70 when the haze phenomenon; in the case of high humidity, PM2.5 30 also lead to the haze phenomenon “.

Cai hair together, the results on the number of cities of PM2.5 in the case of haze, the largest in the north of Taiyuan, south Nanjing, west of the words in Chengdu.

Q5: How to reduce the harm to health? A: The heavy pollution incidents to strengthen the response to the

of PM2.5 pollution is serious, how to reduce air quality and human health damage? Cai CDCC proposed, focusing on scaling up the response to heavy pollution events, “We are not all the time in a very bad environment, take Beijing, year 3 to 5 times of heavy pollution events, each lasting 3-5 So, control of pollution incidents of this a few times, usually people want to drive the car. ” He suggested that air pollution is serious, you can take some special measures, such as to suspend production of some enterprises with serious pollution, suspend the construction of part of the site, and limit the car crossing the road into the city.

does not mean to relax the control of pollution sources. Cai CDCC recommended Guangzhou “drastic”, coal-fired power plants all use of washed coal, after coal washing machinery processing, reducing the ash, sulfur, remove some impurities, suitable for some special purpose, high quality coal, it off in addition to coal, 50% to 80% ash, 30% ~ 40% of the total sulfur (or 60% to 80% of the inorganic sulfur), fueled with coal cleaning can effectively reduce the emissions of soot, sulfur dioxide and nitrogen oxides .

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