Living conditions were the circumstances in which an individual lived.
In 2152, after Jonathan Archer noted the dilapidated state of an alien deuterium mining settlement, he wondered why it was so, as deuterium was highly sought after. T'Pol reminded him that "We're here to trade with them, not judge their living conditions." (ENT: "Marauders")
In 2372, while evaluating Quinn's request to commit suicide, Tuvok suggested an evaluation of the living conditions that gave rise to his desperation, namely, the Q Continuum itself, which he felt Quinn had a right to ask for. (VOY: "Death Wish")