As with the data on emissions, no obvious general trends in air concentrations of

nitrogen oxides in most European cities have been observed. Small decreases in NO2

concentrations are indicated in Austria and Switzerland, where NOx emissions were

reduced by almost 30%. Decreases were also indicated at Swedish urban background

sites after correction of monitoring data for the milder climatic conditions during

recent years (Sjödin et al., 1995). Small decreases were observed at some urban areas

in Denmark. Generally, it has not been possible to collect comparable data from many

countries to estimate the trends.

 

 

 

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