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Front Range
Action Day for Particulates
Until at least 4 p.m. 09/21/2020

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The Colorado Department of Public Health and Environment has issued an ACTION DAY ALERT at 4PM on Sunday, September 20, 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.

Significant activity at the Cameron Peak and Mullen wildfires will result in increasing smoke across the Front Range region Sunday night and Monday morning. Fine particulate concentrations in the Unhealthy for Sensitive Groups category appear likely initially for northern parts of the Front Range, including Ft. Collins and Greeley, then spreading southward into Denver by Monday morning. For health recommendations, please see the Front Range Air Quality Forecast below.

This Particulates Action Day Alert will remain in effect until at least 4 p.m. Monday, September 21, 2020.

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

At 4AM (MST), Monday, 9/21/2020 the highest AQI value was 97 for Particulate less than 2.5 micrometers which indicates Moderate air quality. 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.

The Colorado Department of Public Health and Environment and the Regional Air Quality Council's Summer 2020 Ozone Action Day Alert Program has concluded. The winter High Pollution Advisory Program begins on November 1. Air Quality Action Days or advisories for ozone for other pollutants, however, will be issued as needed at any time during the year and reported on this web page.

The Air Pollution Control Division's Winter 2020/2021 High Pollution Advisory Program will begin November 1. Thank you for your interest in and support for efforts to improve air quality for the citizens of the Denver- metro area.


Front Range Air Quality Forecast & Colorado Smoke Outlook
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FRONT RANGE AIR QUALITY FORECAST:
Sunday, September 20, 2020, 2:00 PM MDT

Ozone concentrations are expected to be in the Good to Moderate range on Sunday. For health recommendations, please refer to Fine Particulate Matter below.

Fine Particulate Matter concentrations are expected to be in the Moderate to Unhealthy for Sensitive Groups range on Sunday and Monday. Fine particulate concentrations in the Unhealthy for Sensitive Groups category will initially be confined to locations in Weld County, including Greeley, however increasing wildfire smoke across the area will result in rising fine particulate concentrations from Ft. Collins southward to Denver early Monday morning. In all these areas, people with heart or lung disease, older adults, and children should reduce prolonged or heavy exertion on Sunday and Monday. For all other parts of the Front Range, unusually sensitive people, should consider reducing prolonged or heavy exertion on Sunday and Monday.

Carbon Monoxide concentrations are expected to be in the Good category on Sunday and Monday.

Nitrogen Dioxide concentrations are expected to be in the Good category on Sunday and Monday.

Visibility on Monday is expected to be Poor.

COLORADO SMOKE OUTLOOK:
Sunday, September 20, 2020, 2:00 PM MDT

Wildfire smoke is expected to increase across the Front Range region Sunday night into Monday morning due to significant fire activity at the Cameron Peak and Mullen wildfires. Smoke will initially increase in areas such as Ft. Collins and Greeley Sunday evening before spreading southward into the Denver metro area by early Monday morning. An Action Day for Fine Particulates has been issued for these areas.

Elsewhere in Colorado, occasional smoke from both in-state and out-of-state wildfires will continue to move through the state Sunday and Monday. Hazy skies and moderate concentrations of smoke will be most likely for northern and western parts of Colorado. Therefore, we suggest that unusually sensitive people reduce prolonged or heavy exertion in all parts of northern and western Colorado through at least Monday afternoon.


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.


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)

Winter High Pollution Advisory Program
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The Winter High Pollution Advisory Program is coordinated by the Air Pollution Control Division of the Colorado Department of Public Health and Environment.

Winter season air pollution forecasts are issued daily from October 31 through March 31 at 4 p.m. When conditions warrant, forecasts will include information about Action Days and subsequent indoor burning restrictions.

An Action Day for fine particulates, carbon monoxide or ozone 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 trigger mandatory restrictions that limit indoor burning to approved devices only (see indoor burning above), voluntary driving reductions, and public health recommendations.

An Action Day for Visibility alone indicates that the Visibility Standard Index for visual air quality is expected to be poor on the current or following day. An Action Day for Visibility will trigger mandatory restrictions on indoor burning and voluntary driving reductions for the seven-county Denver-Boulder metropolitan area only.

When no advisories are issued, air quality is good or moderate and is expected to remain so during the effective period of the forecast. No restrictions are in place.

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.