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The influence of atmospheric precipitation on surface concentrations of minor air gases (O3, NO, NO2, CO and SO2) was studied by the data of measurements in Moscow. For this purpose dynamics of these gases from one minute to another was analyzed in time of each rain. All precipitation events during warm period of one year including even weak rains and, besides, all events of only strong showers during three years were taken into account. As a result of analysis only sulphur dioxide and ozone, unlike other gases, demonstrate on average statistically significant decrease in time of strong showers.