source air pollution

• 空气污染源

source air pollution的用法和样例：

例句

1. Expanding car ownership, heavy traffic and low-grade gasoline have made autos the leading source of air pollution in major Chinese cities.
   增长的汽车保有量，密集交通流量和低标准汽油使汽车成为大城市的主要空气污染源。