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.

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。

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Dust storms are a natural phenomenon, but are influenced by human activities and are now just as serious as traffic and industrial air pollution.

沙尘暴是一种自然现象，但是受到了人类活动的影响，现在和交通和工业空气污染一样严重。

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In all the pictures, the air and light are fuzzy, even bleached - a reminder of both traditional watercolour techniques and the taint of industrial pollution.

所有的照片光线都是模糊的，甚至像是漂白过——传统水彩画技法与工业污染相结合的见证。

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