Why does Immortan Joe wear a mask?

Why does Immortan Joe wear a mask? The mask he wears is for the sense that somehow he himself is immortal. From afar, he looks quite formidable, but his mask is basically a breathing mask, to help him breathe, to help him breathe fresh air, and so, but what better than to turn it into something that also looks horrific?

The mask he wears is for the sense that somehow he himself is immortal. From afar, he looks quite formidable, but his mask is basically a breathing mask, to help him breathe, to help him breathe fresh air, and so, but what better than to turn it into something that also looks horrific?