Trends in atmospheric quality in the UK: (a) sulfur dioxide emissions from coal combustion and averageurban concentrations; (b) smoke emissions from coal combustion and average urban concentrations of oil smoke; (c)increase in winter sunshine (10-year moving average) for London and Edinburgh city centers and for Kew, outer London;(d) annual fog frequency at 0900 GMT in Oxford, central England, 1926–80 (after Department of the Environment data,and Gomez and Smith, 1984, figure 3).
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