Resolved Jun 11, 2026 at 10:00 PM. Kept for reference.
LowWeatherNWS Grand Junction
Air Quality Alert
Mesa County · Started Jun 11, 2026 at 4:10 PM · Updated 13h ago
Mesa Countyarea
Jun 11, 2026, 4:10 PMeffective
Jun 11, 2026, 10:00 PMexpires
NWS Grand Junctionsource
Approximate affected area. Zone-based advisories do not include an exact boundary
Full advisory
The Colorado Department of Public Health and Environment has issued the following...WHAT...Air Quality Health Advisory for Ozone.WHERE...Mesa and Garfield Counties. Locations include, but are not limited to Grand Junction and Glenwood Springs.WHEN...300 PM Thursday June 11 to 1000 PM Thursday June 11IMPACTS...A weather event known as a stratospheric intrusion is occurring. During these events, ozone from high in the atmosphere is pulled to the ground, resulting in elevated ozone concentrations. Ozone is expected to be Moderate to Unhealthy for Sensitive Groups through late Thursday 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.