  Type IIn supernovae occur when stellar explosions are surrounded by dense
hydrogen-rich circumstellar matter. The dense circumstellar matter is likely
formed by extreme mass loss from their progenitors shortly before they explode.
The nature of Type IIn supernova progenitors and the mass-loss mechanism
forming the dense circumstellar matter are still unknown. In this work, we
investigate if there are any correlations between Type IIn supernova properties
and their local environments. We use Type IIn supernovae with well-observed
light-curves and host-galaxy integral field spectroscopic data so that we can
estimate both supernova and environmental properties. We find that Type IIn
supernovae with a higher peak luminosity tend to occur in environments with
lower metallicity and/or younger stellar populations. The circumstellar matter
density around Type IIn supernovae is not significantly correlated with
metallicity, so the mass-loss mechanism forming the dense circumstellar matter
around Type IIn supernovae might be insensitive to metallicity.
