reaching the earth. As an illustration of the effect of turbidity increases in the atmosphere, the total sunshine in urban areas is approximately 80% of that in nearby rural areas. The ultraviolet (UV) component of sunlight in the winter in urban areas is only 70% of that in nearby rural areas; in the summer the UV component in urban areas is 95% of the rural areas' value.
Table 5.1.6 summarizes the quality factors of urban air in ratio to those of rural air when rural air is a factor of 1. The quantity of urban air pollutants and some of the results of the effects of cloudiness and fog are evident in urban areas more than rural areas. Urban areas and the associated air pollutants also influence certain climatolog-ical features such as temperature, relative humidity, cloudiness, windspeed and precipitation.
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