  We develop a general perturbative computation of finite-frequency quantum
noise which applies, in particular, to both good or weakly transmitting
strongly correlated conductors coupled to a generic environment. Under a
minimal set of hypotheses, we show that the noise can be expressed through the
non-equilibrium DC current only, generalizing a non-equilibrium fluctuation
dissipation relation. We use this relation to derive explicit predictions for
the non equilibrium finite frequency noise for a single channel conductor
connected to an arbitrary Ohmic environment.
