The Colorado Department of Public Health and Environment has issued the following... WHAT...Air Quality Health Advisory for Ozone. WHERE...La Plata County. Locations include, but are not limited to the Southern Ute Reservation. WHEN...400 PM Friday August 07 to 1000 PM Friday August 07 IMPACTS...Ozone concentrations in the Unhealthy for Sensitive Groups category are likely within the advisory area Friday afternoon and evening. HEALTH INFORMATION...Public Health Recommendations: Increasing likelihood of respiratory symptoms and breathing discomfort in active children and adults and people with lung disease, such as asthma. Active children and adults, and people with lung disease, such as asthma, should reduce prolonged or heavy outdoor exertion.