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Front Range
Ozone Action Day Alert
Until midnight 07/10/2020

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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 Friday, July 10, 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.

Ozone concentrations have reached levels that are Unhealthy for Sensitive Groups. The highest concentrations of ozone are anticipated in the Colorado Springs area, as well as the Denver Metro area, particularly in the southern and western suburbs, from Highlands Ranch to Golden. Ozone concentrations are expected to be in the Good to Moderate range on Saturday.

This Ozone Action Day Alert will remain in effect until midnight, Friday night, July 10, 2020.

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

The highest Ozone related AQI at 4 o'clock PM Mountain Standard Time on July 10, 2020, is 122 which indicates Unhealthy for Sensitive Groups ozone air quality. It was recorded by the NREL ambient ozone monitor. 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.

The highest Particulate Matter (PM2.5) related AQI at 4 o'clock PM Mountain Standard Time on July 10, 2020, is 50 which indicates Good Particulate Matter (PM2.5) air quality. It was recorded by the GREH ambient monitor.


Front Range Air Quality Forecast & Colorado Smoke Outlook
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FRONT RANGE AIR QUALITY FORECAST:
Friday, July 10, 2020, 2:25 PM MDT

Ozone concentrations are expected to be in the Moderate to Unhealthy for Sensitive Groups range Friday, and in the Good to Moderate range on Saturday.

On Friday, concentrations of ozone in the Unhealthy for Sensitive Groups category are most likely for locations within the Denver Metro area, particularly in the southern and western suburbs from Highlands Ranch to Golden; as well as in the Colorado Springs area. In these areas active children and adults, and people with lung disease should reduce prolonged or heavy outdoor exertion until 8 PM on Friday.

Elsewhere throughout the Front Range, Moderate concentrations of ozone are expected, and unusually sensitive people should consider reducing prolonged or heavy outdoor exertion from noon to 10 PM on Friday and Saturday.

Fine Particulate Matter concentrations are expected to be in the Good to Moderate range on Friday and in the Good category on Saturday. Moderate concentrations of fine particulates are most likely for locations within the Denver Metro area, as well as northward along the Platte River Valley into southern and central Weld County including Greeley. In these areas unusually sensitive people should consider reducing prolonged or heavy exertion on Friday.

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 Good to Moderate.

COLORADO SMOKE OUTLOOK:
Friday, July 10, 2020, 2:40 PM MDT

The 293 acre YMCA wildfire is located in central Fremont County, approximately 4 miles west of Canon City. Winds near the fire are expected to from the west for much of the day on Friday. Smoke impacts are expected to be greatest in areas in the immediate vicinity of the fire, and are expected to improve as atmospheric mixing increases throughout the day. Overnight, light drainage winds may allow smoke to settle in low lying terrain in areas near the fire. Periods of moderate to heavy smoke will be possible in locations including, but not limited to, Canon City, Lincoln Park, and Brookside. While impacts to public health are currently expected to remain low, unusually sensitive people should consider reducing prolonged or heavy exertion in these areas on Friday and Saturday.

Smoke transported from wildfires in Utah and Nevada may produce hazy skies across Colorado on Friday and Saturday. No public health impacts are expected.

Light to moderate concentrations of smoke are also possible near small wildfires and prescribed burns around the state.

What if there is a wildfire or smoke in your area?
The focus of the Colorado Smoke Outlook is on large fires (e.g., greater than 100 acres in size). Nevertheless, smoke from smaller fires, prescribed fires, and/or smoke from new fires not yet known to CDPHE air quality meteorologists may cause locally heavy smoke. If there is smoke in your neighborhood, see the public health recommendations below.

Public health recommendations for areas affected by smoke:
If smoke is thick or becomes thick in your neighborhood you may want to remain indoors. This is especially true for those with heart disease, respiratory illnesses, the very young, and the elderly. Consider limiting outdoor activity when moderate to heavy smoke is present. Consider relocating temporarily if smoke is present indoors and is making you ill. IF VISIBILITY IS LESS THAN 5 MILES IN SMOKE IN YOUR NEIGHBORHOOD, SMOKE HAS REACHED LEVELS THAT ARE UNHEALTHY.


Summer Ozone Program
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Ground-level ozone is an air pollution problem that impacts the health of all Coloradans. Exposure can cause acute respiratory problems and trigger asthma attacks. During Ozone Action Alerts, avoid rigorous outdoor activity during the heat of the day. Prolonged exposure can cause long-lasting damage to your lungs.

You CAN make a difference by doing your part to improve air quality along Denver's Front Range. Combining or skipping just two car trips a week has a positive impact on our air quality. Find other easy solutions that fit your lifestyle from Simple Steps. Better Air. (http://www.SimpleStepsBetterAir.org), a program of the Regional Air Quality Council.

Additional Information
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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 https://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:
https://www.colorado.gov/airquality/burn_forecast.aspx

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

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

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


AIR QUALITY NOTIFICATIONS:
https://www.colorado.gov/airquality/request_alerts.aspx(CDPHE automated e-mail alerts)
http://www.enviroflash.info/signup.cfm(CDPHE forecasts via automated e-mails from the EPA)