Abstract
Acid precipitation measurements are performed at the weather station of Moscow University in winter and summer using both accumulated samples and individual samples. The results are analyzed separately for rain and snow, by collection method, and by wind direction. Snow shows less acidic (higher) pH values than rain. Accordingly, the seasonal march of pH values shows a minimum of acidity in winter and a maximum in June-July. As a general rule, pH values of accumulated and individual samples tend to be similar for time periods with a large number of samples, and wider apart for time periods with fewer samples. In analyzing the distribution of pH values by wind direction, greater acidity is associated with winds from the direction of industrial districts.
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