ACCORDING to modern medicine, the electric condition of atmosphere is an important sanitary factor. In closed localities ventilated normally, man lives in a medium which has not the electric field of open air, but the average ionization of its air is, as a rule, the same as in the open air. There is normally also a slight excess of positive ions over negative ions, as out of doors. Cellars, where the air stagnates and where there is accumulation of radon (radium emanation) released from the walls, are an exception.
Kletschka, J., Gesundheits-Ingenieur, No. 10 (1936).
BÄhounek, F., La Presse thermale et climatique, 79, 350 (1938).
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BÄšHOUNEK, F., KLETSCHKA, J. Ionization of Air in an Air-conditioned Building. Nature 142, 956 (1938). https://doi.org/10.1038/142956a0
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