Actually, during most of my trip, the PM2.5 daily forecasts were in the good (green) category, and it dipped into fair (yellow) for only one day. For a more in

Actually, during most of my trip, the PM2.5 daily forecasts were in the good (green) category, and it dipped into fair (yellow) for only one day. For a more intuitive comparison, the 'fair' day was clearer than Black Rock Desert on a non-windy day before Burning Man gets set up.