WHO: Diesel Exhaust Causes Cancer

 The World Health Organization, upgrading a previous warning, said June 12 that diesel¹ exhaust causes cancer and called for tighter emissions³ standards, comparing the risk of exhaust to second-hand⁴ cigarette smoke.

Tuesday’s announcement comes after international experts spent a week reviewing new research, including an influential⁵ long-term study of more than 12,000 miners who were heavily exposed to diesel exhausts.

The rating upgrades one from 1988, when the WHO’s International Agency for Research on Cancer stated that diesel exhaust was “probably carcinogenic” to humans. This prompted many countries to tighten⁶ diesel emission² standards. Businesses responded with innovations such as lower-sulphur fuel, new engine designs and better exhaust controls, especially in North America and Europe.

Diesel industry lobbyists criticize WHO’s reliance on the mining study because researchers lacked exact data on exposure levels during the study’s early years. Meanwhile, diesel engine makers⁷ point to their new design that produce 95 percent less nitrogen oxide⁸, particulate⁹, and sulfur¹⁰ emissions than older truck and bus engines.

The US Environmental Protection Agency continues to classify diesel more cautiously than the WHO, calling it a “likely” carcinogen.

But Ken¹¹ Donaldson, a professor of respiratory toxicology at the University of Edinburgh, told CBS News, “It’s pretty well known that if you get enough exposure to diesel, it’s a carcinogen.” However, he adds, “For the man on the street, nothing has changed… It’s a known risk but a low one for the average person, so people should go about their business as normal… you could wear a mask if you want to, but who wants to walk around all the time with a mask on?”

1 diesel   

n.柴油发动机，内燃机

参考例句：

• We experimented with diesel engines to drive the pumps.我们试着用柴油机来带动水泵。
• My tractor operates on diesel oil.我的那台拖拉机用柴油开动。

2 emission   

n.发出物，散发物；发出，散发

参考例句：

• Rigorous measures will be taken to reduce the total pollutant emission.采取严格有力措施，降低污染物排放总量。
• Finally,the way to effectively control particulate emission is pointed out.最后，指出有效降低颗粒排放的方向。

3 emissions   

排放物( emission的名词复数 )； 散发物（尤指气体）

参考例句：

• Most scientists accept that climate change is linked to carbon emissions. 大多数科学家都相信气候变化与排放的含碳气体有关。
• Dangerous emissions radiate from plutonium. 危险的辐射物从钚放散出来。

4 second-hand   

adj.用过的，旧的，二手的

参考例句：

• I got this book by chance at a second-hand bookshop.我赶巧在一家旧书店里买到这本书。
• They will put all these second-hand goods up for sale.他们将把这些旧货全部公开出售。

5 influential   

adj.有影响的，有权势的

参考例句：

• He always tries to get in with the most influential people.他总是试图巴结最有影响的人物。
• He is a very influential man in the government.他在政府中是个很有影响的人物。

6 tighten   

v.(使)变紧；(使)绷紧

参考例句：

• Turn the screw to the right to tighten it.向右转动螺钉把它拧紧。
• Some countries tighten monetary policy to avoid inflation.一些国家实行紧缩银根的货币政策，以避免通货膨胀。

7 makers   

n.制造者，制造商（maker的复数形式）

参考例句：

• The makers of the product assured us that there had been no sacrifice of quality. 这一产品的制造商向我们保证说他们没有牺牲质量。
• The makers are about to launch out a new product. 制造商们马上要生产一种新产品。 来自《简明英汉词典》

8 oxide   

n.氧化物

参考例句：

• Oxide is usually seen in our daily life.在我们的日常生活中氧化物很常见。
• How can you get rid of this oxide coating?你们该怎样除去这些氧化皮？

9 particulate   

adj.微小的；n.微粒，粒子

参考例句：

• A special group was organized to dig up the particulate of the case.成立了一个专门小组来查明该案件的各个细节。
• Lungs retain relatively insoluble particulate material.肺脏内留有不溶解的颗粒物质。

10 sulfur   

n.硫，硫磺（=sulphur）

参考例句：

• Sulfur emissions from steel mills become acid rain.炼钢厂排放出的硫形成了酸雨。
• Burning may produce sulfur oxides.燃烧可能会产生硫氧化物。

11 ken   

n.视野，知识领域

参考例句：

• Such things are beyond my ken.我可不懂这些事。
• Abstract words are beyond the ken of children.抽象的言辞超出小孩所理解的范围.