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Abstract The 15N ratio of nitrogen oxides (NOx) emitted from vehicles, measured in the air adjacent to a highway in the Swiss Middle Land, was very high [15N(NO2)=+5.7]. This high 15N abundance was used to estimate long-term NO2 dry deposition into a forest ecosystem by measuring 15N in the needles and the soil of potted and autochthonous spruce trees [Picea abies (L.) Karst] exposed to NO2 in a transect...
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