Crews are focused on protecting homes east of Prineville, including in the Mill Creek, Johnson Creek and Marks Creek areas. Air quality also remained a concern across the Prineville area Tuesday with Air Quality Index readings measuring at 152 out of 500 — considered to be unhealthy for sensitive groups. Air quality remains unhealthy, however, with Air Quality Index readings reaching 187 on Tuesday. Air quality in Baker City measured 157 on the Air Quality Index on Tuesday, a level considered unhealthy. Ontario recorded some of the state’s worst air quality, with a reading of 195.