Abstract

The long distance transport of air pollutants and summer visibility in London is related to sulphate concentration and wind direction. The results suggest that a non-linear, approximately inverse relationship exists between visibility and aerosol sulphate concentration. The worst mean visibility (6.4km) and the highest daily mean sulphate concentration (16.0 μg m −3) both occur in airflows between east and south. The most likely source of the sulphate on these occasions would be emissions on the continental mainland.

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