With location dialogue tracks, a steady background noise can make it difficult to bring quiet scenes forward in the mix without also boosting the distracting noise floor. Using the EQ module before the Voice De-noise module in iZotope RX (Dialogue De-noise in previous versions) can help mitigate this constant noise and allow the voice to be heard more clearly and prominently without losing the ambience of the scene. If removing background noise from dialogue is a frequent noise reduction task for you, consider trying the Dialogue Isolate feature in the Advanced version.
Here is an example of some production audio from a boom mic with a significant amount of background noise from a nearby highway.
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