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Development of mean plot concentration in open-field measurements of sulphate (SO4, 285 plots), nitrate (NO3, 294 plots), and ammonium (NH4, 294 plots); 1996-2001
Geographical coverage note: Plots are located in 14 mostly central European countries and are not representative of the European scale.
The European Environment Agency (EEA) is an agency of the European Union.