Haze it covers with the haze for the health now frequently

Haze it covers with the haze for the health now frequently
Haze it covers with the haze for the health now frequently
Staff reporter Zhang Hao On December 5, haze it comes in North China again. Some area visibility such as Beijing and Tianjin are fewer than 200 meters. How much does it endanger health in the haze? How the government takes action, reduce the injury that it causes to the public of the haze? The person who nears diary has interviewed relevant experts. Haze it influence will it be will it be 30 past 4 afternoon 5 such as health seriously, reporter the intersection of Chinese-Japan Friendship Hospital and the intersection of emergency ward and hall see in Ministry of Public Health, it is already full to rescue in the room. "So many people are ill should relate to air pollution! I came back from the other places on business the day before yesterday, the plane can obviously see one was greyish black ' large pot cover ' will be covered on the city while entering Beijing soon. " A patient relative says to reporters. Environment, Center for Disease Prevention and Control of China, the intersection of the east and groups of researcher Xu introduce, whether no matter the fog haze that the steam forms while reaching the saturation or gray haze formed without reaching the saturation in the air, endanger people's health very big. Lead to the fact the main arch-criminal of it of haze is a detailed particulate matter (namely the diameter is no more than particle of 2.5 microns in the atmosphere, abbreviated as PM2.5) , aerosol particle such as the sulfuric acid, nitric acid, organic hydrocarbon. PM2.5 because its foot-path is small, greater than surface area, there are many poisonous harmful substances absorbed, poisonous harmful substances such as for instance multiloop fragrant hydrocarbon, heavy metal,etc., can reach bronchus even alveolus, and enter blood circulation of whole body through the equilibrium between qi and blood, so it endangers and not merely involves the respiratory system, will also cause danger to the cardiovascular system, immune system,etc.. Announce, this round of 2003 is through drawing the conclusion after the investigation according to American Environmental Protection Agency website: "If PM2.5 is up to standard, the whole U.S.A. can prevent several tens of thousands of people from dying early every year, several tens of thousands of people go to see doctor, delay work up to a million times, up to a million children get respiratory disease. " PM2.5 " enters marking " There are until Beijing is in environment protecting mode for department experts relevant explain on but time issue, can't cause air degree of pollution not to be lasted conclusion that the differences mainly in that, the pollutant measured conventionally at home is not PM2.5, but PM10. So it and though very much high for human body to injure heavy PM2.5, but the air pollution detection that announces fruits " More optimistic" . As to this, DongQun Xu think as to to judge air quality, should it to the intersection of people and as an important standard healthy influence. Before this, the relevant persons in charge of pollution control department of environmental protection department have shown publicly, the problem has not existed yet technically to gauge PM2.5, the problem to be solved is when to include it in " surrounding air quality criteria " urgently at present. But one in the know expert tell reporter whether environmental protection portion make whom relevant standard of PM2.5 consult expose the reaction coefficient and is being offered by World Health Organization recently, coefficient this according to whether compatriot's sample study incomes for the intersection of foreign countries and scientific research institution. And there are very great relations in exposing the reaction coefficient and heredity that reflects whether crowds are sensitive to PM2.5. Our country have little epidemiology of sample investigate data finally, and WHO offer number value to be different only at present, and the large sample census in the whole country is still the blank. Manage haze can only begin from source one engaged in environmental expert of Beijing that atmospheric environmental protection study introduce, China has heavy pollution area of 4 large PM2.5, including yellow Huai-Hai area, long triangular area, pearl triangular area and Sichuan Basin in North China. Source and composition of the regional PM2.5 pollutant are not usually the same. Studies have suggested, PM2.5 makes up and is generally divided into a soluble component, element component and carbon component. Soluble component include sulphate, nitrate, the intersection of ammonium and the intersection of salt, sodium chloride,etc. and inorganic component and the intersection of A and acid, the intersection of B and acid, B two soluble organic matter such as being sour generally among them; The element component includes nearly 40 kinds of metal such as sulphur, nickel, lead and nonmetallic elements, and the organic matter includes constructing alkane hydrocarbon, multiloop aromatic hydrocarbon, heterocyclic compound,etc.. Contain a lot carcinogenic and causing mutation, causing deformity compound and poisonous and harmful chemical composition in the pollutant. Reveal according to " source research of atmosphere detailed particulate matter PM2.5 of Beijing " of thesis that was published in " environmental scientific research " in 2005, the main source of Beijing PM2.5 discharges, building the dust, wind-borne dust, burning, sulphate two times and nitrate and organic matter of bionass for fire coal, motor vehicle exhaust. With the development of economy, the discharge of fire coal and motor vehicle exhaust rises fastest. Measure the result to reveal, the rich collection intensity of elements such as lead, arsenic, copper,etc. is very high in PM2.5. For how reduce the intersection of haze and weather, environmental expert tell reporter whether because of the intersection of particle and characteristic of PM2.5, except that the source is controlled, does not basically have a better method. PM2.5 suspends more stably in the air, it is not high to do and subside and wet and subside to control action, only weather of gale can be spread with higher speed. And it mean that burn, drive few motor vehicles, control the wind-borne dust etc. few that the source is controlled, in addition, it is helpful to control the discharge of volatile organic matter, nitrogen oxide, sulfur dioxide,etc..


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