In discussions on electro smog K. Meyl has proposed to consider the "dangerous" scalar waves (1) in addition to Hertzian waves. But we have already shown in a previous paper (2) that, indeed, Meyl's scalar waves cannot cause any harm, to anybody-since they do not exist. Some readers have interpreted Meyl's scalar waves to be identical with longitudinal electromagnetic waves, but this is not clear due to Meyl's inconsistencies; e.g., his splitting the wave equation is erroneous. Therefore, to calm down our worried readers, below we shall prove that longitudinal electromagnetic waves are harmless as well by recalling a well-known classical result: Plane longitudinal electromagnetic waves do not exist. We supplement this by showing that longitudinal spherical electromagnetic waves have the same pleasant property: They don't exist.
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