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There were made the series of experiments, where the all conditions of "smoked room" were reproduced. Three smokers were placed at the distance of 2 meters from the ion collector. In the first experience each of them smoked one cigar, in the following experiments (in the smoked room) they smoked cigarettes and tobacco-pipe. In each case the smoke was very thick even by visual estimations, and even in some hours the smoke did not completely disapp

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On the 3rd of June 1950 there was one of the greatest thunderstorms that were recently observed in Uppsala. It began very quickly near the city and then abruptly stopped. The period of thunderstorm continued from 3.21PM till 5.35PM. The general quantity of precipitations was 32,3mm, the most effective precipitations were observed at 3.45PM. Thunderstorm moved from west to east.

To get the characteristic of small atmospheric ions quantity there was used the method, which included periodic alternation of limited mobility of simple condenser, through which the air stream passed. According to mobility there was calculated the distribution of ions quantity. The structure of distribution function changed in the course of time. In this work there was discussed the idea that the ions, which were usually called small atmospheric

We found out the correlation between the variations of ions density and definite meteorological factors during the winter period. The same conclusions were made in summer measurements.

As a rule, exit gases have a positive electric charge, but sometimes - a negative one. This charge does not depend on the electric potential of a car. And probably, predomination of water drops or carbon particles in exit gases influences the formation of negative or positive charges.