Front Range Ozone Action Day Alert Until at least 4 p.m. 07/09/2020

The Colorado Department of Public Health and Environment and the Regional Air Quality Council have issued an OZONE ACTION DAY ALERT at 4 p.m. on Wednesday, July 8, 2020 for the Front Range Urban Corridor from Douglas County north to Larimer and Weld counties, including the Denver-Boulder area, Fort Collins and Greeley.

Elevated ozone concentrations are expected on Thursday with some areas possibly reaching the Unhealthy for Sensitive Groups category. Ozone concentrations in the Unhealthy for Sensitive Groups category are most likely for the south and west suburbs of Denver, including Highlands Ranch and Golden.

This Ozone Action Day Alert will remain in effect until at least 4 p.m. Thursday, July 9, 2020.

For statewide conditions, forecasts and advisories, visit:
www.colorado.gov/airquality/colorado_summary.aspx

The highest Ozone related AQI at 7 o'clock AM Mountain Standard Time on July 9, 2020, is 44 which indicates Good ozone air quality. It was recorded by the RFN ambient ozone monitor.

The highest Particulate Matter (PM2.5) related AQI at 7 o'clock AM Mountain Standard Time on July 9, 2020, is 96 which indicates Moderate Particulate Matter (PM2.5) air quality. It was recorded by the I25DEN ambient monitor. Respiratory symptoms possible in unusually sensitive individuals, possible aggravation of heart or lung disease in people with cardiopulmonary disease and older adults. Unusually sensitive people should consider reducing prolonged or heavy exertion.


FRONT RANGE AIR QUALITY FORECAST:
Thursday, July 9, 2020, 7:50 AM MDT

Ozone concentrations are expected to be in the Moderate to Unhealthy for Sensitive Groups range on Thursday. Ozone concentrations in the Unhealthy for Sensitive Groups category are most likely for the south and west suburbs of Denver, including Highlands Ranch and Golden. In these areas, active children and adults, and people with lung disease, such as asthma, should reduce prolonged or heavy outdoor exertion from noon to 8 PM on Thursday. Elsewhere across the Front Range region, unusually sensitive people should consider reducing prolonged or heavy outdoor exertion from noon to 10 PM on Thursday.

Fine Particulate Matter concentrations are expected to be in the Good to Moderate range on Thursday. Moderate concentrations are most likely for locations within the Denver Metro area. In the Denver Metro area unusually sensitive people should consider reducing prolonged or heavy exertion on Thursday.

Carbon Monoxide concentrations are expected to be in the Good category on Thursday.

Nitrogen Dioxide concentrations are expected to be in the Good category on Thursday.

Visibility on Thursday is expected to be Good to Moderate.

Additional Information

WHAT IS AN ACTION DAY?: An Action Day for fine particulate matter, carbon monoxide, ozone or other pollutants indicates that either current air quality is unhealthy or conditions are expected to worsen later in the day or on the next day. Action Days for air pollutants generally indicate that air quality will be in either the Unhealthy or Unhealthy-for-Sensitive-Groups categories according to the Air Quality Index. Action Days always convey overarching public health recommendations, and, according to season, trigger a variety of mandatory and voluntary pollution prevention measures. For example, during the summer open burning is prohibited when an Action Day for ozone and/or fine particulates is in effect. During the winter, residential burning restrictions are in effect when an Action Day for Visibility is in effect.

For a detailed description of both the AIR QUALITY INDEX and the VISIBILITY STANDARD INDEX please visit www.colorado.gov/airquality/brochure.aspx

COLORADO OPEN BURN FORECAST: For those with permits for open burning, that is the burning of waste materials or vegetation outside, check the following webpage to find out if open burning is allowed today. Keep in mind that open burning is prohibited when an Action Day is in effect:
www.colorado.gov/airquality/burn_forecast.aspx

FOR CURRENT FRONT RANGE ACTION DAYS/ADVISORIES:
www.colorado.gov/airquality/advisory.aspx

FOR CURRENT AIR QUALITY CONDITIONS STATEWIDE:
www.colorado.gov/airquality/air_quality.aspx

SOCIAL MEDIA:
www.facebook.com/cdphe.apcd
twitter.com/cdpheapcd


Air Quality Alert

COC013-123-001-031-059-035-005-014-069-092200-
Boulder-Weld-Adams-Denver-Jefferson-Douglas-Arapahoe-Broomfield-Larimer-
810 PM MDT Wed Jul 8 2020

...OZONE ACTION DAY ALERT FROM 400 PM WEDNESDAY UNTIL 400 PM THURSDAY...

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 Wednesday July 08 to 400 PM Thursday July 09

IMPACTS...Ozone Action Day Alert is now in effect for the Front Range Urban Corridor. Requests to limit driving of non-ZEV vehicles (i.e., gas or diesel) are now in effect until at least 4 p.m. Thursday, July 9, 2020. Ozone concentrations should generally remain in the Moderate category throughout the Front Range region on Wednesday. However, higher ozone concentrations are expected on Thursday with some areas possibly reaching the Unhealthy for Sensitive Groups category. Ozone concentrations in the Unhealthy for Sensitive Groups category on Thursday are most likely for the south and west suburbs of Denver, including Highlands Ranch and Golden. For areas included in this advisory that are not expected to reach the Unhealthy for Sensitive Groups (USG) air quality designation, we request that activities, such as driving non-ZEV vehicles (i.e., gas or diesel), be reduced to lessen the impacts on neighboring air quality. Additional air pollution in this region may directly worsen air quality or contribute to precursors which may also adversely affect air quality. For Colorado air quality conditions, forecasts and advisories, visit:
www.colorado.gov/airquality/colorado_summary.aspx

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.