Mariposa County Sunday Afternoon Air Quality Has Decreased to Moderate to Unhealthy for Sensitive Groups as Wildfire Smoke Lingers Update: 3:30 P.M.September 6, 2015 - Air Quality Smoke Impact Report for Mariposa County on Sunday Afternoon, September 6, 2015. Air Quality this afternoon has bumped up into the Moderate to Unhealthy Range for Sensitive Groups.