Abstract
We show that higher-order vacuum polarization would contribute a measurable net charge to atoms, if the charges of electrons and positrons do not balance precisely. We obtain the limit \ensuremath{\Vert}${\mathit{Q}}_{\mathit{e}}$+${\mathit{Q}}_{\mathit{e}\mathrm{\ifmmode\bar\else\textasciimacron\fi{}}}$\ensuremath{\Vert}${10}^{\mathrm{\ensuremath{-}}18}$e for the sum of the charges of electron and positron. This also constitutes a new bound on certain violations of PCT invariance.
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