There are very few studies of absolute and relative humidities in towns although it is obvious that they are subject to a wide variety of controls. Readings taken with a specially instrumented vehicle in Leicester, a town of 270,000 in the English Midlands, suggest that one of the most important determinants is the character of the urban windfield. There is clear evidence that night-time absolute humidities are frequently higher in cities than in the nearby country.

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