It is a weird science, this air. They call it an 'inversion,' here. I don't know why. Maybe because it sounds more phenomenally acceptable than 'smog' – an anomaly of nature; an act of god. It could be an inversion of heaven and hell – the ungodly rising to hover in the lungs of the true believers. Is this a test of faith? The people here, they like their tests (as well as euphemism).
When the rain comes, it breaks through from the sweet warm air above, eating through the scum like salt through ice: tiny punctures, perforations. The particles that hovered in the desert winter air are soaked up the in the moisture, washed down to the valley floor, smeared across our streets, our sidewalks, city skin. The toilette comes away a satisfying shade of human filth; a brown-tan color