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news and views Hamburg defining ten parts per million of nitrogen oxides as the upper level of effluent from fossil-fuel burners. This is quite a difficult limit to achieve because ordinary flame burners give off roughly
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Document Date: 2012-01-06 10:50:11
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news and views Hamburg defining ten parts per million of nitrogen oxides as the upper level of effluent from fossil-fuel burners. This is quite a difficult limit to achieve because ordinary flame burners give off roughly