Hoiatused, Boulder Public Library Carnegie Branch of Local History

Air Quality Alert issued July 17 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 Friday July 17 to 400 PM Saturday July 18 IMPACTS...Ozone Action Day Alert is now in effect for the Front Range Urban Corridor. Hot and sunny weather will result in concentrations of ozone reaching the Unhealthy for Sensitive Groups category on Friday and Saturday. The highest concentrations are most likely in the western portions of the Denver Metro area, including the lower foothills. 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. Saturday, July 18, 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.

Heat Advisory issued July 18 at 4:46AM MDT until July 20 at 9:00PM MDT by NWS Denver CO * WHAT...High temperatures between 98-102 expected on Sunday and Monday. Low temperatures Sunday night will be between 68-71 in the Denver metro. * WHERE...Fort Collins, Boulder, the Denver metro, and Greeley. * WHEN...From 10 AM Sunday 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. Take extra precautions when outside. Wear lightweight and loose fitting clothing. Try to limit strenuous activities to early morning or evening. Take action when you see symptoms of heat exhaustion and heat stroke. 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.