factories were evicted from natural gas transformation

In recent years, through Beijing to host the Olympic Games, the east wind shougang, coking plant pollution such as, outside the city, has made the rings UGG Gaviota within the coal facilities is greatly reduced and the automobile emission standards are increasingly high, and in the early 1990s, compared to the pollution of the city has been fundamental management, Beijing air quality was really getting better and better. But unfortunately, in recent years, Beijing haze weather but more, the 90's before the April, October the month is the day with bright sunshine, but now still will form the city haze weather.

Meteorological professionals research of urban haze weather, generally the urban atmospheric temperature inversion haze weather attributed to the surface layer, is near the atmosphere temperature higher than the atmosphere above the atmospheric temperature, hampering the upper and lower convection. But atmospheric temperature inversion phenomenon is already exists since ancient times the normal phenomenon, natural climate in all night, most of them will most of the formation of atmospheric temperature inversion phenomenon. During the day, cloudy cloudy weather, also very easy to form atmospheric temperature inversion phenomenon. If the haze weather attributed to atmospheric temperature inversion layer caused, why in the early 1990s, Beijing but seldom appears before now so frequent "urban haze weather". If the haze weather is a normal natural phenomenon, why in Beijing's most haze weather, but a mountainous area, yanqing vallely fine.

Pointed out.meanwhile, environmental UGG Gissella professionals, the research of urban haze weather, general urban haze weather due to air pollution - pm10 and sulfide, but remote mountainous areas of mining area, everywhere was powder ore processing factory, each powder ore processing plants above shall lift up huge dust, but these regions just ground material is pollution into ore color, but few smoggy weather phenomenon.

We through the contrast with China each district and county of Beijing weather online meteorological data, a deep research on Beijing nearly a year in the haze weather, found that: "the formation of urban haze weather, not by a decision of the two conditions, but depends on three necessary formation conditions.

Ii. "urban haze weather" three necessary formation conditions

1. The city suburbs around 120 km radius within range exist in air pollution (factory, a large number of stove, auto emissions), and this is the form of "urban haze weather substances internal conditions.

But after 90's intermediate stages, especially since the reform policy was the room for more than ten years development, urban construction, road surface area accounts for the increase significantly. Today's Beijing architectural occupied region, has extended to five rings between six ring road, Beijing building, accounts for the regional area has reached more than 1000 square kilometers, ChengJin suburbs and counties in daxing, tongzhou, shunyi, changping and vallely so-called satellite city, has fully even piece, points out each other. And UGG Highkoo ChengJin suburbs floor height than 1990s much higher, building density and more densely.

Beijing before the early 1990s, 40 years, construction, road accounts for regional area increased by only one times, but nearly 20 years, construction, road accounts for regional area, in the early 1990s basis, and increase the eight times. Nearly 20 years, is equivalent to around Beijing tight and newly built eight 1990s scale of Beijing city. Urban rings within the greenbelt area, far less than the city buildings, streets occupied area. Five rings, six ring between, urban construction, factories, street area, has obviously exceeds the farmland occupied area.

So-called satellite, the suburb of green land far outweigh the urban construction area of circumstances, the suburbs of urban green space overall climate impact far outweigh the urban construction, so as to eliminate urban heat island effect. Beijing's satellite, could hardly be called satellite city building, because distribution area have far greater than the farmland, etc, with the city green area between city greening just city building the stars in the ornament. Urban greening to ease the "urban heat island effect" originally should plays a role, but in city construction area accounts for most cases, urban greening plays a role of soothing effects, it's appeared out.

Moreover, influenced by the Beijing area high prices, the driving effects of hebei, close to Beijing sanhe, extenics, yan jiao, langfang, etc GuAn, zhu state plains, in all industrial development zone, a lot of construction, the surrounding Beijing residential district of farmland, green space in hebei is largely disappearing, pollution in Beijing factories moved UGG Roxy Tall around Beijing, hebei area around Beijing hebei area of air pollution is more and more.

Beijing's so-called "urban heat island effect" phenomenon, is not the 90's period, city and suburbs chaoyang, haidian between the outskirts of temperature difference, but the eight city, the county, daxing, shunyi this whole city buildings sectors-connecting area and yanqing, vallely around Beijing hebei area, and farmland, the area between temperature of urban heat island effect "Beijing" by city centre has moved tongzhou, tongzhou district temperature was mostly Beijing of the highest. (according to the Chinese weather online provide practical meteorological data)

When in northern Beijing haidian district of boreas huairou changping larger, but wind below level 4 cases, Beijing urban heat island center was blowing in south Beijing, but due to the urban heat island effect, circulation south Beijing daxing district but fang shan magmatic, south winds, dongfeng, forming around blowing urban Beijing urban atmospheric circulation, the air pollution UGG Knightsbridge in Beijing city area always reunion. See below for Beijing on 13 June 2010 temperature distribution has the city of each district and county of wind, the wind records.

When Beijing area dongfeng larger, but wind below level 4 cases, the whole city heat island area was blowing Beijing west, but Beijing west mountain block. See below for Beijing June 2010 10 cities temperature distribution.

Beijing area below the wind blow level 4, can rise to the "urban heat island" central region thing north and south offset function. If not more than four wind blow, it is very difficult to Beijing "urban heat island effect" blown. Including whole Beijing huairou, temperature, plain region climate throughout the city heat island by Beijing the effect of control. At present Beijing only do not suffer "Beijing urban heat island" climate in areas affected only yanqing, vallely mountainous areas.

2. Urban heat island effect causes urban atmospheric circulation, the surrounding area air suction to city, level 3 below the horizontal airflow wind to an extra large city "urban heat island effect" powerless, this is the form of "urban haze weather," the important thermodynamics internal conditions.

3. Cloudy, atmospheric temperature inversion layer, make be "urban heat island effect" attract over the city in air pollution, cannot form a longitudinal convection, urban air pollution continue stranded in areas surrounding the cities, which was to lead to "urban haze weather the main external cause."

This is leading cities appear "urban haze of three weather" essential condition, as long as the three necessary conditions exist, it is very easy to create "urban haze weather," the single or two conditions exist, were difficult to form the "urban haze weather," below will bemeeting launched analysis.

(1). Have atmospheric temperature inversion layer and "urban heat island effect", but no pollution, also won't form "urban haze weather"

Because the haze particles is mainly composed of pm10 and sulfides composed of air pollutants, if the city suburbs around 120 km radius within range even further no emission pm10 and sulfide pollution, that UGG Highkoo even if every day have atmospheric temperature inversion layer weather, or "urban heat island effect", also won't form "urban haze weather".

For example, Beijing during the Olympic Games, Beijing and its neighbouring hebei area, the automobile factory all shutdown limit lines, the decrease in the number of vehicles, but total remained high, but Beijing during the Olympic Games "urban haze weather" is greatly reduced and this shows that Beijing circumjacent area factory, construction site in Beijing "urban pollution haze weather has great influence, Beijing automobile emission of Beijing's air pollution effects, has less than surrounding area of factory building site, the effects of the pollution of the role, which mainly attributable to Beijing this years strictly improve automobile exhaust emission standard.

Around Beijing, hebei area of factory, construction site polluted air, certainly also including Beijing car emissions, is to form a Beijing "urban haze weather" is the main material advancement.

(2)) how pollution sources and urban heat island effect ", "but not yet formed atmospheric temperature inversion layer, also hard to form the" urban haze weather"

If no form of atmospheric temperature inversion layer, the atmospheric fluctuation connect fully, city gas pollution easily upward convection, at this time, even urban air pollution discharge is severe, also UGG Liberty can at any time with updraft diffusion emptying, and won't form accumulation, even if there is "urban heat island effect", also can increase urban longitudinal atmospheric convection, the urban air pollution into the air, again through high level of atmospheric flow, the urban air pollution away, spread to other Tibetan regions.

(3). Have pollution and atmospheric temperature inversion layer, but did not form the "urban heat island effect", "urban haze weather" won't be so serious

If the "urban heat island effect" of Beijing city climate effect is small, even with atmospheric temperature inversion, also have air pollution, Beijing night along the northern mountain, west, will blow the valley of northwest wind, will pollute the air along the tongzhou, daxing spread throughout the entire huabei region, and won't like now so, mainly concentrated pollution cities, Beijing city plain region "urban haze weather" than yanqing, vallely internal mountainous area is much more serious.

Another example, early 1990s ago, Beijing city have shougang, coking plant waits numerous polluting factories, urban universal coal and automobile exhaust pollution is more serious than today, though air pollution is more serious than today, also have atmospheric temperature inversion layer weather, but Beijing "urban haze weather" but it is not now so serious, because Beijing UGG Kensington currently "urban heat island effect" size, scope than in the early 1990s much more serious, see below.

Three "urban heat island effect" is to form a Beijing "urban haze weather" the thermodynamics advancement

In the early 1990s of Beijing building, road occupied region, mostly confined to three-ring within, the area is only 140 square kilometers, is less than the whole Beijing its area 1/100, and both are low buildings, than the huge suburban farmland three-ring beyond the "area, then urban heat island effect" of Beijing city climate is still far XingBuCheng significantly influenced