Cleaner air equals longer lives: study

Wed Jan 21, 2009 5:13pm EST
 
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By Gene Emery

BOSTON (Reuters) - Dramatic improvements in U.S. air quality over the last two decades have added 21 weeks to the life of the average American, researchers reported on Wednesday.

Reducing fine particles given off by automobiles, diesel engines, steel mills and coal-fired power plants have added as much as 15 percent of the 2.72 years of extra longevity seen in the United States since the early 1980s, they wrote in the New England Journal of Medicine.

Changes in smoking habits are the biggest reason why Americans are living longer, said Arden Pope, an epidemiologist at Brigham Young University in Utah who led the study.

Improved socioeconomic conditions, judged partly by the proportion of high school graduates living in an area, rank next. But cleaner air was a big factor.

"It's stunning that the air pollution effect seems to be as robust as it is after controlling for these other things," Pope said in a telephone interview.

Using life expectancy, economic, demographic and pollution data from 51 metropolitan areas, Pope and his colleagues found when fine-particle air pollution dropped by 10 micrograms per cubic meter, life expectancy rose by 31 weeks.

Areas such a Akron, Ohio, and Philadelphia showed that kind of drop in air pollution.

The bigger the decline, the longer people began living.   Continued...