What is the dramatic irony in A Streetcar Named Desire?

In "A Streetcar Named Desire," the dramatic irony primarily arises from the audience's awareness of Blanche DuBois's tragic past and deteriorating mental state, while other characters, particularly Stanley Kowalski, remain oblivious to the full extent of her fragility. As Blanche attempts to present herself as refined and in control, the audience knows her façade is crumbling, which heightens the tension in her interactions. This irony culminates in the tragic consequences of her deception, leading to her ultimate breakdown and the chilling conclusion of the play.