The Tennessee Department of Environment and Conservation has issued a Code Orange Health Advisory for the Knoxville area and Great Smoky Mountains. IN EFFECT UNTIL MIDNIGHT EDT THURSDAY NIGHT. A Code Orange Air Quality Alert for ozone means ground level ozone concentrations within the region may approach or exceed unhealthy levels for some people. The general public is not likely to be affected. Active children and adults, and people with a respiratory disease such as Asthma, should limit prolonged outdoor exertion. For additional information. visit the Tennessee Department of Environment and Conservation site at https://www.tn.gov/environment.