Recent years, the harm of acid rain is growing, mainly due to the increase of SO2, HF and other toxic gases of the air.

近年来，大气酸雨问题日益严重，造成酸雨的主要原因是大气中二氧化硫、氟化氢等有毒气体含量的增加。

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The soluble protein contents of the twigs increase under the treatment of acid rain, and the proline and GSH contents increase as well…

与对照相比酸雨胁迫使木麻黄幼苗小枝可溶性蛋白质含量增加，游离脯氨酸和谷胱甘肽含量则极显著增加。

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The problem remains, though, that while the technology is able to cut carbon dioxide emissions, it may still increase another one: nitrogen oxide, tied to smog and acid rain.

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But the government is becoming increasingly concerned about the problems that pollution brings, such as sickness from filthy air and arid soil from acid rain, which has made it keen to boost the use of renewables and increase energy efficiency.

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