Finally, the pollutant emission factors of carbon monoxide (CO),nitrogen oxides ?( NO x)? and hydrocarbons (HC) for automobiles medium truck and heavy truck are solved by using the linear optimization.

• 最后用线性优化的方法求出了轻型车、中型车和重型车一氧化碳（CO）、碳氢化合物（HC）和氮氧化物（NOx）综合排放因子。