A COMPARISON OF URBAN AND RURAL AEROSOL COMPOSITION USING DICHOTOMOUS SAMPLERS

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Abstract

The concentrations and composition of atmospheric aerosols have been measured on a daily basis at two sites, one urban and one rural, near Leeds, W. Yorkshire. The aerosols were collected by automatic dichotomous samplers and particles in both size ranges (≤2.5 and 2.5–15 μm) were analysed for SO2−4, NO3, Cl and NH+4. Simultaneous measurements of dark smoke and SO2 were taken at each site. Preliminary results for the first 3½ months of the survey are given covering the period mid-June to the end of September 1982. The differences between the two sites were generally small during this summer period although under certain meteorological conditions the urban particulate pollutant levels can become considerably higher than the rural levels. Detailed attention is given to the sulphur chemistry and the degree of neutralisation of the aerosols. The fine particle fraction is generally found to be well neutralised by ammonia but acidic aerosols do occur under conditions that lead to low NH3 concentrations.

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