The Working Group realised that the measured concentration of the air pollutants

including NO2 depends very much on the location of the monitoring sites. It was

emphasised that data from different types of sites; high altitude sites, urban

background, residential and rural background areas, are relevant for estimates of the

human exposure, for assessment of the contribution from different sources and for

understanding of the chemical and physical processes, controlling air quality. The

Working Group has considered siting criteria in relation to the above limit values and

alert thresholds based on lowest detectable effects (chapter 3).

 

 

 

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