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Denver Metro

Winter Forecast: No Advisories and No Residential Burning Restrictions

This is the Denver Metro Air Pollution Forecast effective 4PM on Wednesday, 3/27/2024:

Gusty, westerly winds and good atmospheric mixing will result in Good air quality and visibility through Thursday afternoon.

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

A poorly maintained vehicle pollutes more than a well maintained one. If you must drive, properly maintain your vehicle. We'll all breathe easier!

At 11AM (MST), Thursday, 3/28/2024 the highest AQI value was 51 for Ozone which indicates Moderate air quality.


Front Range Air Quality Forecast & Colorado Smoke Outlook
FRONT RANGE AIR QUALITY FORECAST:
Thursday, March 28, 2024, 6:50 AM MDT

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

Fine Particulate Matter concentrations are expected to be in the Good category 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.

COLORADO SMOKE OUTLOOK:
Thursday, March 28, 2024, 7:10 AM MDT

A large prescribed burn is planned to take place on Thursday at the Rocky Mountain Arsenal, just northeast of the Denver Metro area. No public health impacts are expected, however unusually sensitive people should consider reducing prolonged or heavy exertion in this area if smoke is apparent.

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. To temporarily relocate to an area with better air quality, consider using this map (https://fire.airnow.gov/) to identify the best area closest to you. 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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ACTION DAYS: An Action Day for fine particulate matter (particulates), 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 trigger voluntary pollution prevention measures, which may vary by season, and public health recommendations. In addition, during the winter 'high pollution day' season (October 31 to March 31), Action Days trigger mandatory residential burning restrictions (see residential burning below).

Action Days for Visibility alone are issued during the winter 'high pollution day' season (October 31 to March 31), only. At the time they are issued (4 PM), action days for visibility indicate that the Visibility Standard Index for visual air quality is expected to be poor on the following day. Action Days for Visibility trigger mandatory residential burning restrictions and voluntary driving reductions for the seven-county Denver-Boulder metropolitan area only (see residential burning below).

The VISIBILITY STANDARD INDEX reports the air's visual quality in the seven-county Denver-Boulder metropolitan area. The visibility standard is 0.076 per kilometer of atmospheric extinction, which means that 7.6 percent of the light in a kilometer of air is blocked. The level must exceed the standard based on a four-hour average for a violation to occur. On the Visibility Standard Index Scale, a value of 101 equates to the 0.076/km standard. Values between 0-50 are good, 51-100 moderate, 101-200 poor and 201-plus extremely poor.

The AIR QUALITY INDEX reports the daily level of air pollution on an hourly basis. The index reports the highest level of either carbon monoxide, fine particulates or ozone depending on which pollutant has the greatest hourly concentration. Values greater than 100 for carbon monoxide, fine particulates and ozone indicate exceedances of the pollutant's state and federal standards. Air Quality Index values between 0-50 are good, 51-100 moderate, 101-150 unhealthy for sensitive groups, 151-200 unhealthy, 201-300 very unhealthy, and over 300 hazardous.

RESIDENTIAL BURNING: On Action Days issued during the winter 'high pollution day' season (October 31 through March 31), mandatory residential burning restrictions generally apply to everyone in the entire seven-county Denver-Boulder metropolitan area below 7,000 feet. The restrictions will be enforced through local ordinances or a state regulation.

The state regulation applies to any community in the seven-county Denver-Boulder metropolitan area that did not have its own mandatory residential burning ordinance in effect on January 1, 1990. Under this regulation, the only exceptions to the residential burning restrictions are for residences above 7,000 feet in the seven-county Denver-Boulder metropolitan area; and those who use Colorado Phase III (Phase II EPA) certified woodburning stoves, Colorado approved pellet stoves, approved masonry heaters or those whose stoves or fireplaces are their primary source of heat. For more information on residential burning restrictions, call the Air Pollution Control Division at (303) 692-3100.
For more, go to: http://www.cdphe.state.co.us/ap/woodhome.html

COLORADO OPEN BURN FORECAST: For those with permits for Open Burning, that is burning of waste materials or vegetation outside, check the following webpage to find out if open burning is allowed today:
http://www.colorado.gov/airquality/burn_forecast.aspx

For current air quality information and updates:
http://www.colorado.gov/airquality/advisory.aspx
http://www.colorado.gov/airquality/air_quality.aspx

About the Air Quality Index:
http://www.epa.gov/airnow/aqi_brochure_08-09.pdf

Summer Ozone Program
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For an AQI value that considers all pollutants, please click here.

Ground-level ozone is a summertime air pollution problem that is created when other pollutants from sources like vehicle exhaust, paints, degreasing agents and cleaning fluids react with sunlight. Exposure to ground-level ozone can cause acute respiratory problems, reduced lung capacity and inflammation of lung tissues and can trigger asthma attacks.

Ground-level ozone should not be confused with the protective stratospheric ozone layer miles above the Earth's surface. This naturally-occuring ozone layer protects the Earth's surface from excessive ultra-violet radiation.

Do your share and be a part of the solution to the Denver-metropolitan area's summertime air pollution problems. These easy strategies will help reduce the harmful vapors that react in sunlight to create summertime air pollution:

At Home:

  • Tightly cap all solvents (paint thinners and strippers, degreasers, and some cleaning products). Solvents contain pollution-causing vapors.
  • Postpone painting, stripping and refinishing projects to avoid the morning and mid-day summertime heat. Better yet, wait until the Fall or Spring.
  • Use water-based products (paints, stains and sealants).

In the Yard:

  • Delay mowing your lawn to another day. Don't mow, let it grow!
  • Avoid using high-emitting, gasoline-powered yard equipment. Electric alternatives are an efficient, environmentally-friendly alternative.
  • Use an electric starter or a "charcoal chimney" to start your barbeque grill. Lighter fluid contains a lot of harmful vapors that escape into our air and contribute to summertime air pollution.

On the Go:

  • Stop at the click when refueling your car. Overfilling your tank often results in fuel spills and always allows unnecessary pollution-causing vapors to escape into our air.
  • Refuel in the evenings after dusk. By refueling after the sun goes down, fuel vapors do not have as much of a chance to "cook" in the mid-day sun and become harmful ground-level ozone.
  • Maintain your vehicle. A poorly-maintained vehicle can pollute as much as 25 times more than a well-maintained one.

To learn more about the summer ozone program, visit:
http://www.SimpleStepsBetterAir.org

© Colorado Department of Public Health and Environment, Denver, CO