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 Beijing Zhonghuan environmental quality monitoring center professional third party environmental monitoring and testing agency
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Current position: haze
smog
Date of issue: 2014-10-24 11:02:06 source: our website editor: admin

smog

???? yes fog and Haze Of combination Words. Haze is common in city China Many areas will fog Incorporation Haze Together as Disastrous weather Phenomenon early warning and prediction, collectively referred to as“ Haze Weather ”。

??? Haze is specific climate The result of the interaction between conditions and human activities. high density The economic and social activities of the population will inevitably emit a lot of fine particles( PM?2.5 )Once the emission exceeds the atmospheric circulation capacity and carrying capacity, the concentration of fine particles will continue to accumulate. At this time, if affected by the static and stable weather, it is easy to appear a large range of haze.

???? two thousand and thirteen "Haze" became the key word of the year. This year's one Month, four Sub haze process shrouded thirty In Beijing, only five It's not a haze day. According to a report, China's largest five hundred Of the cities, only less than 1% At the same time, the world's most polluted cities ten Cities have seven It's in China.

???? two thousand and fourteen year one month four National disaster reduction Office Ministry of Civil Affairs For the first time, the haze weather endangering health was included two thousand and thirteen The natural disasters were reported.

???? two thousand and fourteen year two Month, Xi Jinping During the inspection in Beijing, it was pointed out that the first task to deal with haze pollution and improve air quality is to control PM2.5 We should take major measures from the aspects of reducing coal consumption, strictly controlling vehicles, adjusting industries, strengthening management, joint prevention and control, and governing according to law. We should focus on key areas, strictly assess indicators, strengthen environmental law enforcement and supervision, and seriously investigate the responsibility.

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Composition

Haze is caused by dust in the air

???? It is composed of sulfuric acid, nitric acid, organic hydrocarbon and other particles. It can also make the atmosphere cloudy, blurred vision and cause visibility deterioration if the horizontal visibility is less than ten thousand Haze is called haze, which is caused by the non-aqueous aerosol system (Haze) Or haze( Dust-haze )The Hong Kong Observatory is called haze (Haze) ?

???? sulfur dioxide The first two are gaseous pollutants, and the last one is the main culprit of haze. They combine with the fog and make the sky gray for an instant. The abbreviation of particulate matter is PM Yes, Beijing PM2.5 Which is less than the aerodynamic equivalent two point five Micron pollutant particles.

Haze is mainly caused by sulfur dioxide nitrogen oxide and Inhalable particulate matter Let's combine these three together sky In an instant it became gloomy and grey. The abbreviation of particulate matter is PM What Beijing is monitoring Fine particles PM2.5 )In other words, the aerodynamic equivalent diameter is less than or equal to two point five Micron pollutant particles. The particle itself is not only a pollutant, but also a pollutant heavy metal Polycyclic aromatic hydrocarbons The carrier of toxic substances.

The distribution of haze particles is uniform, and the size of haze particles is relatively small zero point zero zero one Micron to ten Micron, average diameter is about one two About micron, the particles floating in the air can't be seen by naked eyes. Because of dust sulphuric acid And nitric acid particle The haze is composed of more light with longer scattering wavelength, so the haze looks yellow or orange gray.

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Beijing Central Environmental Quality Monitoring Center
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