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 (6.4 km) 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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