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Abstract
Continuous measurements of pH precipitation falling from cumulus clouds in semi-arid region (Colorado,USA),and in wet temperate zone (Bologna,Italy) were made.In Colorado the pH was constant at 7.3 for a period of time,and later changed to 7.0 and remained constant at this value during the remainder of the storm.In Italy the pH fluctuated continuously between the approximate values of 5.7 and 6.4 during the storm.The changes in hydrogen ion concentration reflect the chemical composition of cloud condensation nuclei and of scavenged aerosol particles andg ases presented in the region.
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