In combination with SOx, one of the causes of acid rain.

与氧化硫相结合后，成为形成酸雨的原因之一。

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China's soaring energy needs and reliance on coal have made it the world's biggest emitter of sulphur dioxide, which causes acid rain and respiratory problems.

中国飙升的能源需求以及对煤炭的依赖，已使其成为全球最大的二氧化硫排放国——二氧化硫能导致酸雨和呼吸道疾病。

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We might look upon the glory of our Rust Belt states, where there are hundreds of vast steel mills that are at least 40 years out of date and also spew smoke that causes acid rain.

我们可以看一下我们的铁锈带（）昔日的“荣耀”，那里有几百家落伍至少四十年的大型钢铁厂，至今还喷吐着能够引起酸雨的浓烟。

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Filters remove most of the pollutant that causes acid rain, and new technology soon to be put in place will remove most of the pollutant that causes smog.

CNN: Energy debate may soon turn on 'cleaner' coal