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What is PM2.5?

Published:2013-02-13 21:19 Click:wait for……
summary:What is PM2.5? PM2.5 is the diameter of the atmosphere is less than or equal to 2.5 micron particles, also known as the particles into the lungs. PM2.5 just a few components of the Earths atmospheric composition content, but it is important...
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What is PM2.5?

    PM2.5 is the diameter of the atmosphere is less than or equal to 2.5 micron particles, also known as the particles into the lungs. PM2.5 just a few components of the Earth's atmospheric composition content, but it is important in air quality and visibility. PM2.5

The small particle size, rich in a large number of toxic and hazardous substances and long residence time in the atmosphere, conveying distance, and thus the greater the impact on human health and the quality of atmospheric environment. In February 2012, the State Department agreed to release the newly revised ambient air quality standard

The quasi "increase the PM2.5 monitoring indicators. September 9, 2012, the Beijing Municipal Environmental Protection Monitoring Center, said the new version of the air quality publishing platform on-line on January 1, 2013. October 6, 2012, Beijing 35 PM2.5 monitoring site commissioning data all on the line

Release.

    Scientists with PM2.5 particles per cubic meter of air content, the higher the value, on behalf of the more serious air pollution.

    Respirable particulate matter and total suspended particles in urban air quality daily or weekly two people more familiar with atmospheric pollutants.

    Inhalable particles also called PM10, refers to a diameter greater than 2.5 microns, is equal to or less than 10 microns, the particles can enter the human respiratory system; total suspended particles also called PM100, i.e. diameter less than or equal to 100 microns particulate matter.

2010 data

    In Beijing, Shanghai, Guangzhou, Xi'an PM2.5 pollution in 2010, respectively, resulting in premature death number 2349,2980,1715,726 people, a total of 7770 people, accounted for the proportion of the total number of deaths in the year to 1.9%, 1.6%, 2.2%, 1.5% of economic losses

Lost for of 18.6,23.7,13.6,5.8 billion, for a total of 6.17 billion yuan, respectively.
Shanghai premature deaths due to PM2.5 caused the largest number. "This factor is more complicated, I think there are three main factors, First Shanghai as the country's most populous city, and the second is the degree of response of southerners and northerners sensitivity to environmental factors not

Same, around the PM2.5 composition harm.

    The major source of PM2.5 generated residue after burning emissions in the course of daily power generation, industrial production, automobile exhaust emissions, most of them contain heavy metals and other toxic substances.

    In general, the particle size of 2.5 microns to 10 microns thick particles from road dust, etc.; fine particulate matter less than 2.5 microns (PM2.5) primarily from the burning of fossil fuels (such as motor vehicle exhaust, coal-fired), volatile organic matter.

Health damage

    Meteorological experts and medical experts believe that the haze caused by fine particulate matter on human health hazards even more than sandstorm. The particles in the particle size of 10 microns or more, will be blocked in the outside of the person's nose; particle diameter of 2.5 microns to 10 microns

Between the particulate matter, be able to enter the upper respiratory tract, but some can be excreted by sputum, etc., the other will also be nasal internal villus barrier, harmful to human health is relatively small; while the fine particles of particle size less than 2.5 microns in diameter not to the man's head

1/20 the size of the hair, is not easily blocked. Be inhaled directly into the bronchial interfere with gas exchange in the lungs, triggering asthma, bronchitis and cardiovascular disease, and other aspects of the disease.

    Each day average intake of about 10,000 liters of air, dust can quickly be absorbed into the alveoli, not directly into the blood circulation after liver detoxification distributed throughout the body; Secondly, would undermine the ability of hemoglobin to transport oxygen, the loss of blood. Of depleted

, Could have serious consequences for the patient of blood and blood circulation disorders. For example, can aggravate respiratory diseases and even lead to congestive heart failure and coronary heart disease. In short, these particles can also enter the blood through the bronchial and alveolar

Fluid, including harmful gases, heavy metals dissolved in the blood, the greater the damage to human health. Physiological structure of the human body no filtering, blocking ability of PM2.5, PM2.5 harm to human health as the medical technology into

Step gradually exposes terror.

    In EU countries, PM2.5 lead to people's average life expectancy is 8.6 months lower. PM2.5 can also become a carrier of viruses and bacteria, fueling the spread of respiratory diseases. Major developed countries in the international as well as Japan, Thailand, Asia

Country, India, are included in the PM2.5 air quality standards. The most sad reminder that before 2012, PM2.5 has not yet been included in China's ambient air quality indicators, so it became a direct conflict of data, and the government of the United States Embassy official data fundamental

Reasons.

    Chinese Academy of Engineering, Wei Fusheng, former chief engineer of the China National Environmental Monitoring Center study results also showed that the higher the concentration of PM2.5 and PM10, children and their parents respiratory illness incidence higher PM2.5 impact is particularly significant.

Monitoring standards

    Standard for PM2.5 is proposed by the United States in 1997, mainly in order to more effectively monitor, with increasingly advanced industrialized ignored the old standard of fine particulate matter harmful. PM2.5 index has become a

To the degree of monitoring and control of air pollution index.

    In addition to the United States and some EU countries included in the PM2.5 GB mandatory restrictions until the end of 2010, most countries in the world have yet to carry out the monitoring of PM2.5, most traffic monitoring for PM10. National Aeronautics and Space

The bureau (NASA) announced in September 2010, a global map of air quality, designed to display the density of PM2.5 over the world. Map of global air quality map produced by two researchers at Dalhousie University, Canada. According to NASA two

Satellite monitor monitoring results, draw a map shows the 2001-2006 average PM 2.5. Red in this picture (ie PM2.5 highest density), in North Africa, East Asia and China. North China, East China and Central China PM2.5

The density, the index is even close to 80 micrograms per cubic meter, even more than the Sahara Desert.

    In this 2001-2006 average global air pollution situation map, the PM2.5 region with the highest in the world all in North Africa and the North China, East China, Central China.

    The World Health Organization (WHO), PM2.5 less than 10 security value, these are all higher than 50 close to 80, much higher than the Sahara Desert.

(Editor:admin)
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