A diffusion tube survey of NO2 levels in urban areas of the U.K. |
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| Institution: | 1. Swedish Institute of Space Physics, Box 812, Kiruna 981 28, Sweden;2. Space Research Institute, Austrian Academy of Sciences, Graz, Austria;3. Key Laboratory of Earth and Planetary Physics, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, China;4. College of Earth and Planetary Sciences, University of Chinese Academy of Sciences, Beijing, China;5. IRAP, Toulouse, France |
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| Abstract: | A nationwide survey of ambient NO2 concentrations has been carried out by Warren Spring Laboratory and AEA Technology, Harwell, in urban areas of the U.K. The survey utilised passive diffusion tube samplers, deployed at 363 existing smoke/SO2 monitoring stations, and ran from July to December 1986.Although undertaken primarily to provide an independent check on the siting of monitoring stations to determine compliance with the European Community NO2 Directive, the survey provides for the first time a nationwide picture of urban levels of this pollutant. London was found to experience the highest average NO2 concentrations in the U.K., with these being highest close to busy roads. Concentrations were found to be only moderately higher in winter than in summer.Correlations between measurements of SO2, smoke and NO2 were examined. The closest correlation is observed between NO2 and smoke, indicating traffic to be a dominant source of these pollutants. NO2 data are also shown to correlate well with disaggregated NOx emission data for the U.K. |
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