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  3. Nobody pretends that polluted air isn’t terrible for your health. Clean up the skies over any dirty city, and the people who liv

Nobody pretends that polluted air isn’t terrible for your health. Clean up the skies over any dirty city, and the people who liv

admin2021-02-21  87
问题    Nobody pretends that polluted air isn’t terrible for your health. Clean up the skies over any dirty city, and the people who live there will all but certainly become healthier. According to a study just published, when local governments decide to remove the smog, local residents actually live an average of five months longer.
   In order to reach so precise a finding, the study’s authors had to do some exhaustive number-crunching, surveying pollution rates and longevity in 51 cities across the U.S. over a 21-year period. Overall, they found that lifespan in all of the areas increased by an average of nearly three years—from 74 to 77—as a result of a host of factors, most notably reduced smoking and improved income. But 15% of the change was attributable to cleaner air.
   One of the reasons making air cleaner can have so immediate an effect is that even a little dirt can do a lot of damage. A reduction of just 10 micrograms of pollution per cubic meter of air—a degree of improvement many of the surveyed cities were able to attain during the two-decade-plus period—could extend human life-spans a full nine months. How small is 10 micrograms per cubic meter? Consider that simply by living with a cigarette smoker, you’re exposed to a daily dose of 20 to 30.
   Pittsburgh, Pennsylvania, for example, is one city in the survey that was at the 30-microgram level before the decline of the steel industry in the 1980s drove the dirt out of the skies—even as it drove jobs out of town. Pittsburgh was one of the biggest winners in the new study, with residents gaining roughly 10 months in life expectancy over what they had when the mills were still churning.
   The benefits of cleaner air may even be felt in towns whose skies weren’t that dirty to begin with. Those that began with the very lowest levels still saw health benefits from small improvements. The evidence isn’t yet there to determine whether those benefits would continue growing until the fine-particle pollution got down to zero; one of the cities closest to that, Albuquerque, New Mexico, still hovers around 5 micrograms per cubic meter. But at this point, it doesn’t seem that the benefits decrease. "If it continues to follow what we’ve observed, it appears that there are health benefits down to very low levels of exposure," says Dr. Pope, the study’s lead author.
   The next step for both researchers and policymakers is determining which sources of dirt—power plants, motor vehicles, other industrial polluters—make the biggest contributions to particle levels and thus should be most aggressively targeted. "In a difficult economic situation," asks Dr. Douglas Dockery, "where can we spend the dollars that would have the most benefit?"
   As with so many other things, President Barack Obama’s coming into power has people hoping that these kinds of questions will be more aggressively addressed than they were over the past eight years. Even during the most heated days of the fall campaign, neither candidate went so far as to promise longer life in exchange for a vote. But a smart environmental policy could deliver just that.
   [A] benefited from the downturn in its steel industry.
   [B] won the presidential election mainly by promising to increase American people’s lifespan.
   [C] can still see benefits of air improvement despite its already clean air.
   [D] took measures to improve its air quality after 1980s.
   [E] is supposed to take active steps to tackle environmental problems including air pollution.
   [F] shows concern about which sources of dirt contribute most to air pollution.
   [G] agrees that even improvement in slightly polluted air may bring health benefits.
Dr. Douglas Dockery
选项
答案F
解析 Dr．Douglas Dockery出现在文中倒数第二段。该段先说，下一步要做的就是确定哪种污染源是导致空气中颗粒物污染的最大元凶，并对其重点治理。接下来Dr．Douglas Dockery提出疑问。“在如今经济不景气的情况下，如何投入资金才能获得最大的收益呢?”可以看出，Dr．Douglas Dockery关心哪些是最严重的污染源这一问题。F正是表达了这个意思，其中contribute most to air pollution是原文make the biggest contributions to particle levels的同义转述，故确定F为本题答案。
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