# HEADLINE
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OZONE ACTION DAY ALERT FROM 400 PM MONDAY UNTIL 400 PM TUESDAY
# SUMMARY
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The Colorado Department of Public Health and Environment has issued the following...
WHAT...Ozone Action Day Alert.
# DETAILS
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WHERE
Douglas, Jefferson, Denver, western Arapahoe, western Adams, Broomfield, Boulder, Larimer, and Weld Counties
WHEN
400 PM Monday July 13 to 400 PM Tuesday July 14
IMPACTS
Ozone Action Day Alert is now in effect for the Front Range Urban Corridor. Ozone concentrations in the Unhealthy for Sensitive Groups category are expected during the afternoon and evening hours on both Monday and Tuesday. The highest ozone concentrations are expected within and near the foothills from western parts of the Denver metro area northward to areas west of Ft. Collins. 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. Tuesday, July 14, 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.
ISSUED AT
Monday, July 13, 2026 at 4:10 PM MDT
ISSUED BY
Relayed by National Weather Service Boulder CO
HEADER
Air Quality Alert Message | Colorado Department of Public Health and Environment
# AREAS AFFECTED
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Weld, Adams, Arapahoe, Boulder, Broomfield, Denver, Douglas, Jefferson, Larimer