手机也会排放废气以及煤化物。
如果车辆没有妥善维修保养，在怠车慢速时候，将会排放更多废气以及更多的石油燃料。
If a car did not maintain well, the car driving in slow velocity will emit more waste gas and spent more petroleum.
煤炭燃烧的主要缺点——也是工业城市的特色——是烟尘、粉尘、灰渣和废气以及大量的温室气体二氧化碳污染了空气。
A major disadvantage of coal combustion-and characteristic of industrial cities-has been air pollution by soot, dust, ash, exhaust and large amounts of the greenhouse gas carbon dioxide.
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