It frequently contributes to the smogs over Los Angeles.
同时它也常常引起洛杉矶上空的烟雾。
Vehicles also cause air pollution, which produces city smogs, acid rain, and global warming.
交通工具也能造成空气污染，这种污染也产生了城市烟雾，酸雨和全球变暖。
Vehicles also cause air pollution, which produces city smogs, acid rain, and global warming.
交通工具也能造成空气污染，这种污染也产生了城市烟雾，酸雨和全球变暖。
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