Characteristics of air pollution in Birmingham, England. II. On the significance of sampling height.

Air quality data for "standard smoke" and for sulphur dioxide in central Birmingham are examined for the influence of sampling height. Data from two sites at the same location but separated vertically by about 30 m indicate that the effect of sampling height can change over a period of several years. For standard smoke the effect of height appears to be diminishing, whereas for sulphur dioxide the effect of sampling height appears to be increasing.