| Researchers led by George Malone at the University of Delaware began dealing with the problem in two thousand. 由特拉华大学George Malone领导的研究员们在2000年开始着手处理这一问题。 They found that over a period of six years, planting three rows of trees reduced total dust and ammonia by more than half. 经历六年的时间，他们发现，种植三排树木就能减少总计超过一半的尘埃和氨。 And they found that odors were reduced by eighteen percent. 并且他们发现气味可以减少18%。 The scientists reported their findings in two thousand eight at a meeting of the American Chemical Society. 科学家们在2008年美国化学学会的一个会议上报告了他们的这些发现。 For the first row nearest the fans, they generally suggested trees that lose their leaves in the fall or trees with waxy leaf surfaces. 距离风扇最近的第一排树木，他们一般建议种植秋季落叶的树木或者带有蜡质叶表面的树。 |
