The company said research has shown that at such intersections, automobile emissions can be 29 times higher than on open roads.
该公司表示，研究表明，在这样的十字路口，汽车废物排放量可能是主干道上的29倍。
英语百科
Vehicle emissions control
（重定向自Automobile emission）
Vehicle emissions control is the study of reducing the motor vehicle emissions—emissions produced by motor vehicles, especially internal combustion engines.