Der größte Teil wird zumindest in den Einleitungssätzen erwähnt, wie die Atmosphäre ist. Trotzdem habe ich noch einen Link gefunden, der vielleicht hilfreich sein könnte:

,,What we know about the atmosphere of setting in Streetcar comes from Williams’s stage directions. He tells us that us that the area is "poor" but "has a raffish charm." He says the sky is "a peculiarly tender blue, almost a turquoise, which invests the scene with a kind of lyricism and gracefully attenuates the atmosphere of decay. […] In this part of New Orleans, you are practically always just around the corner […] from a tinny piano being played with the infatuated fluency of brown fingers. […] New Orleans is a cosmopolitan city where there is a relatively warm and easy intermingling of races" (Stage Directions, Scene One). Here’s a great image of this mood-setting coloring, by the way."

http://www.shmoop.com/streetcar-named-desire/setting.html