Benzene Warning--开车前请先开窗

山菊花 (2010-06-30 15:47:32) 评论 (1)

Benzene Warning


Do not turn on A/C immediately as soon as you enter the car! Please open the windows after you enter your car and do not turn ON the air-conditioning immediately.

According to a research done, the car dashboard, sofa, air freshener emits Benzene, a Cancer causing toxin (carcinogen- take note of the heated
plastic Smell in your car). In addition to causing cancer, it poisons your bones, causes anemia, and reduces white blood cells. Prolonged exposure will cause Leukemia, increasing the risk of cancer. May also cause miscarriage.

Acceptable Benzene level indoors is 50 mg per sq. ft.. A car parked indoors with the windows closed will contain 400-800 mg of Benzene. If parked outdoors under the sun at a temperature above 60 degrees F, the Benzene level goes up to 2000-4000 mg, 40 times the acceptable level ... and the people inside the car will inevitably inhale an excess amount of the toxins.

It is recommended that you open the windows and door to give time for the interior to air out before you enter. Benzene is a toxin that affects your kidney and liver, and is very difficult for your body to expel this toxic stuff.
 

Origins:   This item about the dangers of benzene supposedly emitted by automobile components has been widely misunderstood. Many readers have come away from the article with the impression that it warns drivers not to use their cars' air conditioning because the A/C system itself is producing benzene, but what the article actually cautions against is the practice of turning on the air conditioning immediately upon entering an automobile. Motorists should instead, it says, roll down their windows in order to allow accumulated benzene fumes (allegedly emitted by other components, such as dashboards and upholstery) to vent from the car first before closing the windows and turning on the A/C.

How much truth is there to this warning? Evidence suggests an association between exposure to benzene and an excess risk of leukemia, as noted by the American Cancer Society (ACS):
A considerable number of human studies provide evidence linking benzene and cancer. Initially, increased risks of leukemia, chiefly AML, were reported among workers with high levels of benzene exposure in the chemical, shoemaking, and oil refining industries. More recently, studies have focused on workers with relatively lower exposure.

The human data are supported by animal studies. There is sufficient evidence for the carcinogenicity of benzene in experimental animals. Key animal studies support the finding of an excess risk of leukemia in humans from exposure to benzene by inhalation and ingestion. The details of these studies have been reviewed and found to support the association between benzene and cancer.
But do automobiles really produce potentially cancer-causing levels of benzene? A 2001 study of commuter exposure (in both cars and buses) in Korean urban areas found some relationship between automobile use and exposure to benzene, but its observations differed from the warning quoted above in some significant areas:
  • The study found that traveling by automobile increased exposure to a number of deleterious compounds, including benzene, but the primary factor in this regard was the fuel used by the vehicles, not internal components such as dashboards.

  • The study found that benzene levels were higher in older cars than newer cars, which suggests that the primary factor in automobile benzene levels is not associated with the "new car smell" emitted by components such as dashboards and upholstery.

  • The study found that exposure levels were significantly higher during the winter months, which suggests that automobile air conditioning use is not a major factor in benzene exposure.
The study itself did not establish a connection between commuter exposure to benzene and the onset of cancer.

Last updated:   8 June 2009

The URL for this page is http://www.snopes.com/medical/toxins/benzene.asp

这是朋友寄来的,不管真假,小心没大错吧。为方便阅读,从网上找来这篇中文的~~~遥谢不知名的作者!



開車前請先開窗

開車的民眾要注意,根據美國加州大學的研究發現,汽車的儀表板、沙發、內裝和芳香劑,會揮發致癌物質「苯」。

苯類化合物是很強的致癌物質,也是很強的骨髓毒性物質,它會造成一般人的貧血或者是白血球稀少,長期暴露的話,得到白血 病,就是血癌的風險大為增加,有些孕婦還會因此流產。 

和室內每立方公尺苯的正常標準值50微克相比,室溫下的密閉汽車裡含有400800微克的苯,如果在太陽下曝曬1小時,溫度超過攝氏60度,苯含量更高達2千到4千微克,是正常標準的40倍以上,開車族不能倖免吸入過量的苯。 

林口長庚毒物科主任林杰樑:「你的愛車停在太陽底下超過1個鐘頭,甚至不需要1個鐘頭的時候,你要去開車的時候,你要切 記,一定要把窗戶搖開把門打開,讓這些有毒氣體揮散掉以後,你才能夠開車。」醫師指出,「苯」屬於肝腎代謝的有毒化學物質,人體很難自然排出,只能提醒民 眾在開車前請先開窗。

 

Open the windows after you enter your car

 

In brief, the above article says:  According to research done by a U.C., the car dashboard, sofa, air freshener will emit Benzene, a cancer causing toxin (carcinogen).  In addition to causing cancer, it poisons your bones,  causes anemia, and reduces white blood cells.  Prolonged exposure will cause Leukemia, increasing the risk of cancer.  May also cause miscarriage.  

Acceptable Benezene level indoors is 50 mg per sq. ft.  A car parked indoors with the windows closed will contain 400-800 mg of Benezene.  If parked outdoors under the sun at a temperature above 60 degrees F, the Benezene level goes up to 2000-4000 mg, 40 times the acceptable level.  The people inside the car will inevitably inhale an excess amount of the toxin.  

It is recommended that you open the windows and door to give time for the interior to air out before you enter.  Benzene is a toxin that affects your kidney and liver, and is difficult for your body to expel.

 来源:http://irving12.spaces.live.com/blog/cns!19443B2649E5C0BE!16521.entry?wa=wsignin1.0&sa=781135984


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