Nitrogen oxide released from nitrogen fertilisers accumulates in the atmosphere as a green house gas that is 300 times more damaging than carbon dioxide.
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本文介绍的铜制件光亮酸洗钝化工艺，既无有毒的含铬物质，又无氮氧化物污染。
The no pollution bright pickling passivation technique of copper parts introduced in this pa-per, has neither the toxic chromium containing materials nor nitrogen oxide pollution.
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