Air Quality Alert — Jefferson County, Colorado
Pollutant or particulate levels are expected to reach unhealthy levels, especially for sensitive groups.
Current Status
😷 Active: Air Quality Alert
Air Quality Alert issued August 1 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 August 01 to 400 PM Sunday August 02 IMPACTS...Ozone Action Day Alert is now in effect for the Front Range Urban Corridor. Hot and sunny weather with light winds will allow ozone to reach the Unhealthy for Sensitive Groups category on Saturday and Sunday. Elevated levels of ozone are possible throughout the northern Front Range region, with the highest concentrations most likely in the western portions of the Front Range. 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, August 2, 2026. Colorado is also addressing ozo
Effective August 1, 2026 at 6:10 PM ET · Expires August 2, 2026 at 6:00 PM ET
Event Details
Event Type
Air Quality Alert
Severity
unknown
Issued By
NWS Denver CO
Expires
August 2, 2026 at 6:00 PM ET
Last Checked
1 minute ago
Also In Effect For
This same Air Quality Alert also covers:
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Frequently Asked Questions
What does a Air Quality Alert mean for Jefferson County, Colorado?
Pollutant or particulate levels are expected to reach unhealthy levels, especially for sensitive groups.
Is this Air Quality Alert currently active?
Yes — this alert is active as of our last check (1 minute ago). It's set to expire August 2, 2026 at 6:00 PM ET.
How do I get notified about Air Quality Alert alerts for Jefferson County?
Download StormCast free on Google Play and set Jefferson County, Colorado as one of your monitored locations. StormCast checks the NWS feed continuously and pushes alerts like this directly to your phone — even with the screen off.
What other areas does this alert cover?
This same Air Quality Alert is also in effect for Denver County, Douglas County, Weld County, Boulder County, Broomfield County, Adams County, Arapahoe County, Larimer County.