emission estimation

• 污染源

emission estimation的用法和样例：

例句

1. Vehicle emission has become the major sources of air pollutants in the large cities.
   大城市中机动车排放已成为主要大气污染源。
2. The determination of odorant emission from an odor pollution source is a difficult problem.
   恶臭污染源污染物排放量的确定是一个难题。