Objectives of the Study

This study was devised in order to investigate these potential problems, and to provide a detailed inter-comparison between diffusion tubes and chemiluminescence analysers.
The principal objectives were as follows;

• To undertake a 12 month inter-comparison of measured concentrations between diffusion tubes and chemiluminescence analysers at UK Automatic Urban Network monitoring stations;
  
  
• To establish any differences between 2-week and 4 week exposure periods;
  
  
• To establish the optimum exposure period for comparison with chemiluminescent analysers;
  
  
• To investigate the potential effects of light and wind turbulence on diffusion tube measurements.
  
  

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  Study undertaken jointly by Stanger Science and Environment and the National Environmental Technology Centre.
  Site prepared by the National Environmental Technology Centre, part of AEA Technology, on behalf of the UK Department of the Environment, Transport and the Regions