Abstract
As part of an extensive study of the effects of air pollution on health, measurements of pollution have been made at a site in the City of London for more than ten years. The results of daily measurements of the concentration of smoke and sulphur dioxide made throughout that period and of more frequent measurements made during episodes of high pollution are reported in this paper. These show a reduction in the annual mean and peak concentrations of smoke during the ten year period, but there have not been any significant changes in the concentrations of sulphur dioxide. Occasional measurements of a wide range of other pollutants are also reported and results from a series of measurements of polycyclic aromatic hydrocarbons indicate a decline in the concentration of this potentially carcinogenic component of pollution in London.
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