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Congested cities are fast becoming test tubes for scientists studying the impact of traffic fumes on the brain. As roadways choke on traffic, researchers suspect that the tailpipe exhausted from cars and trucks-especially tiny carbon particles already implicated heart disease, cancer and respiratory ailments-may also injure brain cells the key to leaming and memory.(1)____(2)____(3)____ New public-health studies and laboratory experiments suggest that, at every stage of life, traffic fumes exact a measuring toll on mental capacity, intelligence and emotional stability.(4)____
Children in areas affected by high levels of emissions, on average, scored more poor on intelligence tests and were more prone to depression, anxiety and attention problems than children growing in cleaner air, separate research teams in New York, Boston, Bejjing, and Krakow, Poland, found.(5)____(6)____ And older men and women long exposing to higher levels of traffic-related particles and ozone had memory and reasoning problems effectively added five years to her mental age, other university researchers in Boston reported this year.(7)____(8)____(9)____ The emissions may also height the risk of Alzheimer's disease and speed the effects of Parkinson's disease.(10)____
"The evidence is growing that air pollution can affect the brain," says medical epidemiologist Heather Volk at USC's Keck School of Medicine. "We may be starting to realize the effects are broader than we realized."
文章大意
本文讨论的是汽车尾气的危害。如今的交通越来越拥堵，研究人员怀疑，各类轿车和卡车释放的尾气，特别是已经被证明会造成心脏病、癌症和呼吸道疾病的碳微粒，可能还会伤害对学习和记忆起关键作用的脑细胞。最新的公共卫生研究和实验室实验表明，在生命的每个阶段，汽车废气都会对人的心智能力、智力和情感稳定能力造成一定程度的损害。
