中文摘要：

以机动车在匝道上的行驶速度为纽带,通过建立车速与匝道长度、机动车污染排放与车速之间的关系,推导出了机动车污染排放与匝道长度的关系,利用积分的方法对匝道变速运动段机动车污染排放进行了计算,提出了基于几何线形的道路立交处机动车污染排放计算方法,并通过算例进行了验证。结果表明：该方法能够将机动车污染排放和道路立交几何线形联系起来对机动车污染排放进行计算,根据道路立交几何线形设计文件就可以计算出立交投入使用后的机动车污染排放总量。

英文摘要：

Taking vehicle speed on ramps as a link,relationship between vehicle＇s pollution emission and length of ramp was deduced through establishing the relationship between vehicle speed and the length of ramp,as well as vehicle＇s pollution emission and vehicle speed.Then,the integral method was used to calculate vehicle＇s pollution emission on speed shifting section of ramp.The calculated method of vehicle＇s pollution emission of interchange based on geometric alignment was put forward and it was verified by practical example.Results show that this method can connect vehicle＇s pollution emission with the interchange＇s geometric alignment to calculate vehicle＇s pollution emission.According to the interchange＇s geometric alignment design document,the total vehicle＇s pollution emission volume of interchange in use can be calculated.