  An analysis of the influence of the Landau-Migdal-Pomeranchuck (LPM) effect
on the development of air showers initiated by astroparticles, is presented. By
means of computer simulations using algorithms that emulate Migdal's theory,
including also the so-called dielectric suppression, we study the behaviour of
the relevant observables in the case of ultra high energy primaries. We find
that the LPM effect can significantly modify the development of high energy
electromagnetic showers.
