SALEM, Ore. (AP) — The Oregon Department of Environmental Quality has issued an air quality advisory, for the next several days for parts of Southern Oregon that may be impacted by smoke coming from a wildfire in Northern California. Oregon Public Broadcasting reports that Lakeview and Klamath Falls areas fall under the air quality advisory. Smoke levels and locations can change rapidly, depending on the weather. The DEQ recommends keeping an eye on the air quality index. In September, almost all of Oregon was covered in thick layers of unhealthy smoke, as wildfires stretched across the state. Researchers and health experts told OPB that having such high levels of smoke for so many people was unprecedented.