The Colorado Department of Public Health and Environment has issued an ACTION DAY ALERT at 4PM on Friday, September 1, 2017 for the Front Range Urban Corridor from El Paso County north to Larimer and Weld counties, including the Denver-Boulder area, Colorado Springs, Fort Collins and Greeley.
Light winds, ample sunshine, and warm temperatures will promote ground-level ozone formation and Unhealthy for Sensitive Groups conditions are expected for the southern and western suburbs of the Denver Metro Area on Saturday.
This Action Day Alert will remain in effect until at least 4 PM Saturday, September 2, 2017.
For statewide conditions, forecasts and advisories, visit:
http://www.colorado.gov/airquality/colorado_summary.aspx
At 1PM (MST), Friday, 9/1/2017 the highest AQI value was 57 for Particulate FRONT RANGE AIR QUALITY FORECAST:
Friday, September 1, 2017, 2:30 PM MDT
Ozone concentrations are expected to be in the Good to Moderate range on Friday, and Moderate to Unhealthy for Sensitive Groups on Saturday. Unhealthy for Sensitive Groups conditions are expected in the southern and western suburbs of the Denver Metro Area on Saturday. Active children and adults, and people with lung disease, such as asthma, should reduce prolonged or heavy outdoor exertion in these areas between the hours of noon to 8 PM on Saturday.
Fine Particulate Matter concentrations are expected to be in the Good to Moderate range on Friday and Saturday. Moderate concentrations of fine particulates are expected throughout the Northern Colorado Front Range including the Denver Metro area, Fort Collins, and Greeley. Unusually sensitive people should consider reducing prolonged or heavy exertion throughout the Front Range region on Friday and Saturday.
Carbon Monoxide concentrations are expected to be in the Good category on Friday and Saturday.
Nitrogen Dioxide concentrations are expected to be in the Good category on Friday and Saturday.
Visibility on Saturday is expected to be Moderate to Poor.
COLORADO SMOKE OUTLOOK:
Friday, September 1, 2017, 2:30 PM MDT
Areas of haze are likely on Friday and Saturday across Colorado due to smoke being transported from wildfires in the northwestern United States. No major health impacts are anticipated, however unusually sensitive people should consider reducing prolonged or heavy exertion on Friday and Saturday.