  The relationship between active galactic nuclei activity and environment has
been long discussed, but it is unclear if these relations extend into the dwarf
galaxy mass regime -- in part due to the limits in both observations and
simulations.
  We aim to investigate if the merger histories and environments are
significantly different between AGN and non-AGN dwarf galaxies in cosmological
simulations, which may be indicative of the importance of these for AGN
activity in dwarf galaxies, and whether these results are in line with
observations.
  Using the IllustrisTNG flagship TNG100-1 run, 6\,771 dwarf galaxies are found
with 3\,863 ($\sim$57 per cent) having some level of AGN activity. In order to
quantify `environment', two measures are used: 1) the distance to a galaxy's
10th nearest neighbour at 6 redshifts and 2) the time since last merger for
three different minimum merger mass ratios. A similar analysis is run on
TNG50-1 and Illustris-1 to test for the robustness of the findings.
  Both measures yield significantly different distributions between AGN and
non-AGN galaxies; more non-AGN than AGN galaxies have long term residence in
dense environments while recent ($\leq 4 \text{ Gyr}$) minor mergers are more
common for intermediate AGN activity. While no statements are made about the
micro- or macrophysics from these results, it is nevertheless indicative of a
non-neglible role of mergers and environments.
