  We consider a single-layer graphene with high ripples, so that the
pseudo-magnetic fields due to these ripples are strong. If the magnetic length
corresponding to a typical pseudo-magnetic field is smaller than the ripple
size, the resulting Landau levels are local. Then the effective properties of
the macroscopic sample can be calculated by averaging the local properties over
the distribution of ripples. We find that this averaging does not wash out the
Landau quantization completely. Average density of states (DOS) contains a
feature (inflection point) at energy corresponding to the first Landau level in
a {\em typical} field. Moreover, the frequency dependence of the ac
conductivity %while the average ac conductivity contains a maximum at a
frequency corresponding to the first Landau level in a typical field. This
nontrivial behavior of the effective characteristics of randomly strained
graphene is a consequence of non-equidistance of the Landau levels in the Dirac
spectrum.
