  Inspired by recent astrophysical observations of leptonic excesses measured
by satellite experiments, we consider the impact of some general models of the
dark sector on the muon production in extensive air showers. We present a
compact approximative expression for the bremsstrahlung of a massive photon
from an electron and use it within Monte Carlo simulations to estimate the
amount of weakly interacting photon-like massive particles that could be
produced in an extensive air shower. We find that the resulting muon production
is by many orders of magnitude below the average muon count in a shower and
thus unobservable.
