  Data from the LIGO detectors typically contain many non-Gaussian noise
transients which arise due to instrumental and environmental conditions. These
non-Gaussian transients can be an issue for the modelled and unmodelled
transient gravitational-wave searches, as they can mask or mimic a true signal.
Data quality can change quite rapidly, making it imperative to track and find
new sources of transient noise so that data are minimally contaminated. Several
examples of transient noise and the tools used to track them are presented.
These instances serve to highlight the diverse range of noise sources present
at the LIGO detectors during their second observing run.
