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A system of Imaging Air Cherenkov Telescopes (IACTs) can be triggered by hadronic events containing Cherenkov light from at most two electromagnetic subcascades, which are products of a single π0 decay. The recorded images of those showers have similar shapes to the primary γ-ray events. Therefore, they are hardly reducible background for observations using IACTs. In this paper, the impact of the single π0 events on the efficiency of the γ /hadron separation was studied using the Monte Carlo simulations. The fraction of events containing the light from the single π0 in the expected total protonic background depends on the trigger threshold, reflector area and altitude of the observatory. The calculated quality factors are anti-correlated with contributions of single π0 events in the proton initiated showers with primary energies below 200 GeV. The occurrence of the single π0 images is one of main reasons for the deterioration of the γ/hadron separation efficiency at low energy.

The background from single pi0 events in the IACT observations