An Ozone Action Alert is issued on days when meteorologists from the Colorado Department of Public Health and Environment (CDPHE) expect weather conditions to lead to increased ground-level ozone concentrations in the metropolitan-Denver and Front Range region.

An alert indicates the potential for elevated 8-hour ozone levels. The alert will remain in effect for 24 hours.

Non-Alert Day		Ozone Alert Day

How do I know when an alert is in effect?

To find out about current air quality conditions, visit this site often, sign up to receive ozone action alerts via e-mail on the home page or call the 24-hour hotline number at 303-758-4848.

What should I do when an alert is in effect?

During an ozone action alert, you can make a special effort in taking some simple actions including:

	Stop at the click – do not overfill gas tanks when refueling.
	Keep vehicles regularly maintained.
	Tighten gas caps after refueling.
	Mow in the evening.
	Refuel in the evening.
	Use new earth friendly lawn equipment.

By taking these actions, you can help keep the metropolitan Denver region a healthy, clean city in which to live, work and play.

When are the alerts issued?

Between June 1 and August 31, the Regional Air Quality Council (RAQC) will issue daily ozone advisories at 4:00 p.m. The RAQC issues the alerts to the media, individuals, local governments and businesses.

How are the alerts determined?

Meteorologists at the CDPHE analyze weather forecasts and ozone monitoring data from around the region to predict expected ozone levels. In general, hot, sunny and windless conditions increase the likelihood of high ozone concentrations, while clouds, wind and more moderate temperatures can help prevent ozone formation.

I have more questions. Who should I ask?

If you have questions or need more information, please contact the Regional Air Quality Council at staff@raqc.org or 303-629-5450, ext. 210. Or, visit this page: http://apcd.state.co.us/psi/o3_advisory.phtml