CDPHE Air Pollution Control Division

High ozone possible for the northern Front Range with plenty of wildfire smoke heading into western Colorado. Get all the details at https://www.colorado.gov/airquality/default.aspx and visit the Colorado Smoke Blog https://colosmokeoutlook.blogspot.com/

Elevated levels of ozone are possible on Monday and Tuesday in the northern Colorado Front Range. An Ozone Action Day alert is in effect until at least 4 pm on Tuesday. https://www.colorado.gov/airquality/advisory.aspx

Ozone levels remain high on Saturday afternoon, so the Ozone Action Day Alert has been extended until midnight Saturday night. Breezy winds are expected to keep ozone Good to Moderate on Sunday. https://www.colorado.gov/airquality/advisory.aspx

An Ozone Action Day Alert is in effect until at least 4 pm Saturday.

For more information: https://www.colorado.gov/airquality/advisory.aspx

An Ozone Action Day Alert is in effect until at least 4 pm Friday.

For more information: https://www.colorado.gov/airquality/advisory.aspx

An Air Quality Health Advisory is in effect for Mesa County.

An event known as a stratospheric intrusion is occurring. Ozone is expected to be in the Moderate to Unhealthy for Sensitive Groups Range in Mesa County through Thursday evening.

Learn more here: https://www.colorado.gov/airquality/colo_advisory.aspx

An Ozone Action Day Alert is in effect until 4 PM Thursday.

Ozone will remain Moderate on Wednesday, but reach Unhealthy for Sensitive Groups on Thursday.

For more details: https://www.colorado.gov/airquality/advisory.aspx

An Ozone Action Day Alert is in effect until Midnight Friday night.

High ozone will continue through Friday evening, but breezy weather on Saturday will limit ozone development.

For more details: https://www.colorado.gov/airquality/advisory.aspx

An Air Quality Health Advisory for Ozone is in effect for Mesa and Garfield Counties until 10 PM Thursday. For more details: https://www.colorado.gov/airquality/colo_advisory.aspx

Ozone was enhanced on Thursday by influence from the upper atmosphere, however high levels of ozone in the Front Range remain possible on Thursday and again on Friday. An Ozone Action Day alert has been issued until 4 pm on Friday. Reduce outdoor exertion if possible to avoid exposure and impacts. https://www.colorado.gov/airquality/advisory.aspx