
Air quality
12.7 3.10 PM 15.10 – 12.7 10.00 PM 22.00
Air Quality Alert issued July 12 at 9:10AM MDT by NWS Denver CO The Colorado Department of Public Health and Environment has issued the following... WHAT...Ozone Action Day Alert. WHERE...Douglas, Jefferson, Denver, western Arapahoe, western Adams, Broomfield, Boulder, Larimer, and Weld Counties WHEN...400 PM Saturday July 11 to 400 PM Sunday July 12 IMPACTS...Ozone Action Day Alert is now in effect for the Front Range Urban Corridor. Hot, dry, and stagnant weather will allow ozone to reach the Unhealthy for Sensitive Groups category on Saturday and Sunday. For Colorado air quality conditions, forecasts, and advisories, visit: https://www.colorado.gov/airquality/colorado_summary.aspx If possible, please help us reduce ozone pollution by limiting driving gas and diesel-powered vehicles until at least 4 p.m. Sunday, July 12, 2026. Colorado is also addressing ozone pollution through state policies. For more information about health impacts and how ozone pollution forms in Colorado, visit: https://cdphe.colorado.gov/ozone- pollution-and-your-health HEALTH INFORMATION...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.
National Weather Service
Air quality
11.7 10.10 PM 22.10 – 12.7 10.00 PM 22.00
Air Quality Alert issued July 11 at 4:10PM MDT by NWS Denver CO The Colorado Department of Public Health and Environment has issued the following... WHAT...Ozone Action Day Alert. WHERE...Douglas, Jefferson, Denver, western Arapahoe, western Adams, Broomfield, Boulder, Larimer, and Weld Counties WHEN...400 PM Saturday July 11 to 400 PM Sunday July 12 IMPACTS...Ozone Action Day Alert is now in effect for the Front Range Urban Corridor. Hot, dry, and stagnant weather will allow ozone to reach the Unhealthy for Sensitive Groups category on Saturday and Sunday. For Colorado air quality conditions, forecasts, and advisories, visit: https://www.colorado.gov/airquality/colorado_summary.aspx If possible, please help us reduce ozone pollution by limiting driving gas and diesel-powered vehicles until at least 4 p.m. Sunday, July 12, 2026. Colorado is also addressing ozone pollution through state policies. For more information about health impacts and how ozone pollution forms in Colorado, visit: https://cdphe.colorado.gov/ozone- pollution-and-your-health HEALTH INFORMATION...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.
National Weather Service
High temperature
13.7 4.00 PM 16.00 – 14.7 3.00 AM 03.00
Heat Advisory issued July 12 at 1:11PM MDT until July 13 at 9:00PM MDT by NWS Denver CO * WHAT...High temperatures in the upper 90s. * WHERE...Fort Collins, Boulder and the western suburbs of Denver, and Denver. * WHEN...From 10 AM to 9 PM MDT Monday. * IMPACTS...Hot temperatures may cause heat illnesses. Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. To reduce risk during outdoor work, the Occupational Safety and Health Administration recommends scheduling frequent rest breaks in shaded or air conditioned environments. Anyone overcome by heat should be moved to a cool and shaded location. Heat stroke is an emergency! Call 9 1 1.
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