  We present a study of the close (< 200 kpc) environment of 110 relatively
local (z< 0.16) HII galaxies, selected from the Sloan Digital Sky Survey (SDSS;
DR7). We use available spectroscopic and photometric redshifts in order to
investigate the presence of a close and possibly interacting companion galaxy.
Our aim is to compare the physical properties of isolated and interacting HII
galaxies and investigate possible systematic effects in their use as
cosmological probes. We find that interacting HII galaxies tend to be more
compact, less luminous and have a lower velocity dispersion than isolated ones,
in agreement with previous studies on smaller samples. However, as we verified,
these environmental differences do not affect the cosmologically important
L_{H{\beta}}-{\sigma} correlation of the HII galaxies.
