HEALTH REPORT – Study Links Ozone Pollution to Increased De
HEALTH REPORT – Study Links Ozone 1 Pollution to Increased Deaths
By Cynthia Kirk
Broadcast: Wednesday, December 08, 2004
I'm Gwen Outen with the VOA Special English Health Report.
American researchers say they have found the strongest link yet between ozone pollution and damage to health. Their findings 2 show that short-term 3 increases in ozone lead to higher death rates in cities.
Ozone is a form of oxygen. The gas is produced naturally in the upper atmosphere to protect the Earth against radiation from the sun. But human activity can also create ozone in the lower atmosphere.
Gasses from vehicles and industry react with sunlight to form this ozone. Levels usually increase in the warmer months. Ozone is the main chemical in smog, the air pollution that is a combination 4 of fog and smoke.
Ozone has been linked to heart and lung problems especially, and to higher rates of hospital cases.
Researchers from Yale University and Johns Hopkins University did the study. Michelle Bell of Yale was the lead investigator 5. The Journal 6 of the American Medical Association 7 published the results.
The researchers collected information on ninety-five American cities. These contain about forty percent of the national population. The study compared deaths rates to ozone levels between nineteen eighty-seven and two thousand.
The research suggests that even a small increase in ozone, ten parts per thousand million, can lead to higher death rates the following week. The study found that the average daily number of deaths rose point-five percent. Heart and lung related 8 deaths rose point-six percent. And deaths among older people rose point-seven percent.
The researchers controlled for other possible causes of death, such as hot weather or pollution from particle 9 matter. The study linked even a single day of increased ozone to more deaths the following week.
The study is one of the largest ever done of ozone and death rates. The researchers note that ozone is widespread in the United States and many other countries.
The United States Environmental Protection Agency 10 is re-examining its air pollution rules. The current limit for ozone is eighty parts per thousand million for an eight-hour period. Limits were higher in the past. But the researchers say they found an increase in deaths even below the current levels.
They say that if ozone decreased by one-third in those ninety-five cities, almost four thousand lives per year might be saved.
This VOA Special English Health Report was written by Cynthia Kirk. I'm Gwen Outen.
- The ozone layer is a protective layer around the planet Earth.臭氧层是地球的保护层。
- The capacity of ozone can adjust according of requirement.臭氧的产量可根据需要或调节。
- It behoves us to study these findings carefully. 我们理应认真研究这些发现。
- Their findings have been widely disseminated . 他们的研究成果已经广为传播。
- The short-term training class has been run three times.短训班办了三期。
- For this they are running short-term courses and evening classes.为此，他们办了短训班和夜校。
- He carried on the business in combination with his friends.他与朋友们合伙做生意。
- The materials can be used singly or in combination.这些材料可以单独使用也可以混合用。
- He was a special investigator for the FBI.他是联邦调查局的特别调查员。
- The investigator was able to deduce the crime and find the criminal.调查者能够推出犯罪过程并锁定罪犯。
- He kept a journal during his visit to Japan.他在访问日本期间坚持记日记。
- He got a job as editor of a trade journal.他找到了一份当商业杂志编辑的工作。
- Our long association with your company has brought great benefits.我方和贵公司的长期合作带来了巨大的利益。
- I broke away from the association ten years ago.我10年前就脱离了那个团体。
- I am not related to him in any way.我和他无任何关系。
- We spent days going through all related reference material.我们花了好多天功夫查阅所有有关的参考资料。
- There is not a particle of truth in what you said.你所说的没有一句是实话。
- This particle has a very small mass.这种粒子的质量很小。