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  • Denver Air Quality Moderate, Particulate Matter Levels Elevated

    Denver Air Quality Moderate, Particulate Matter Levels Elevated
    2025/11/15
    Denver’s air quality today is classified as moderate, with primary concern stemming from elevated levels of particulate matter less than 10 micrometers in diameter. The highest recorded Air Quality Index, or AQI, reached 81 in the Denver metro area early this morning, driven mainly by fine particles from vehicle emissions, construction dust, and other urban sources. The concentration measured was 115 micrograms per cubic meter over a 24-hour period, which places some sensitive groups at risk for mild respiratory symptoms. For most people, breathing in Denver today will not cause any noticeable effects, but individuals with existing heart or lung conditions, older adults, or anyone unusually sensitive to air pollution should limit strenuous outdoor activities until conditions improve.

    Visibility has also been a concern, meeting thresholds that prompted local officials to declare an Action Day for Visibility. Restrictions on indoor burning are in effect until late afternoon, and authorities encourage residents to refrain from unnecessary driving to help reduce particle pollution and haze. Other air pollutants, such as ozone, carbon monoxide, and nitrogen dioxide, remain well within safe ranges citywide. Ozone levels have held steady in the “good” category, with no notable spikes in gases or additional advisories except for particle pollution and visibility concerns.

    Historically, Denver’s air quality remains within World Health Organization safe limits on nine out of ten days. Today’s moderate status is typical for this time of year, when colder weather leads to temperature inversions and air pollution can accumulate near the ground. Officials expect conditions to improve by tomorrow as forecast particulate and visibility levels trend downward, allowing for normal outdoor activity for all residents.

    In summary, while Denver’s air is not pristine today, it is generally safe for healthy adults and children. Those with sensitivities should reduce heavy exertion outdoors, and all residents are encouraged to minimize activities that contribute to particulate buildup. Stay informed and check updates if you plan to spend extended time outdoors, especially if visibility is poor during afternoon commutes.

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  • Denver Air Quality Moderate, Visibility Concern Sparks Action Day

    Denver Air Quality Moderate, Visibility Concern Sparks Action Day
    2025/11/12
    Denver’s air quality on Wednesday, November 12, 2025, reached a moderate level, mainly due to elevated concentrations of particulate matter. By 10 AM, the Air Quality Index, or AQI, climbed to 59 for particles less than 10 micrometers in diameter. This places Denver in the moderate category where air remains generally acceptable for most of the population but could prompt symptoms in those unusually sensitive to air pollution, such as people with existing respiratory illnesses or heart disease. If you fit these categories, consider limiting strenuous outdoor activity during peak hours today.

    A notable factor today is the Action Day for Visibility declared across the Denver-Boulder metro area. This alert means indoor burning restrictions are now in place, and local officials are encouraging the public to limit driving of gas and diesel-powered vehicles. Visibility is forecasted to be especially poor during the afternoon, exceeding the state’s standard threshold for haze.

    The moderate air quality was driven almost entirely by particulate matter, with a maximum concentration of 59 micrograms per cubic meter recorded during the day. No other air pollutants, such as ozone, carbon monoxide, or nitrogen dioxide, exceeded levels considered good according to state monitors. Ozone levels have remained in the good range, and no additional health advisories are in effect outside of particulate pollution and visibility reduction.

    In summary, most people in Denver will not be directly affected by today’s air quality. However, if you are unusually sensitive to air pollution, especially fine particles, it is advisable to be cautious and avoid prolonged outdoor exertion. City officials remind residents to help improve air quality by minimizing activities that contribute to particle pollution, like using wood-burning stoves and unnecessary car trips, until the Action Day expires at 4 PM. For everyone else, today’s conditions mean it is a good day to stay mindful of visibility if you’re commuting, and to look out for updates if sensitivities or health risks apply to you[1][2].

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  • Denver Air Quality Ranges from Good to Moderate on Saturday

    Denver Air Quality Ranges from Good to Moderate on Saturday
    2025/11/08
    Denver’s air quality today is expected to range from good to moderate, with no advisories or indoor burning restrictions in effect for the metropolitan region. Breezy winds combined with strong atmospheric mixing are allowing pollutants such as ozone, carbon monoxide, nitrogen dioxide, and fine particulate matter to remain at levels classified as either good or moderate for Saturday’s forecast period.

    As of Friday afternoon, Denver’s highest measured Air Quality Index was 51 for fine particulates smaller than 2.5 micrometers. This falls into the moderate category, which means most people can go about their usual activities, but individuals who are unusually sensitive to particle pollution, such as those with heart or lung disease or older adults, may experience minor respiratory symptoms or aggravation of their conditions. In those cases, reducing heavy or prolonged exertion outdoors can be advisable.

    Ozone concentrations are forecasted to be in the good range for both Friday and Saturday. Carbon monoxide and nitrogen dioxide are also expected to remain at good levels. Visibility is anticipated to be good to moderate for most of the day. These conditions are typical for the Front Range during this part of the year, aided by atmospheric mixing which disperses pollutants and limits buildup.

    Historically in 2025, Denver has experienced generally healthy air: 90 percent of the days so far this year have met the World Health Organization’s safe air quality limits, indicating a very low risk for health problems from pollution. However, Denver remains on watch for ozone pollution, as periods of heat and wildfire smoke can trigger worse conditions—this summer, for instance, air quality advisories and action days were issued in response to high ozone and particulate levels.

    For today, most residents and visitors in Denver should find outdoor conditions comfortable, but those with heightened sensitivity to air pollution may wish to take basic precautions, such as limiting strenuous outdoor activity during afternoon highs in particulate concentration.

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  • Denver Air Quality Generally Good, Winter Pollution Advisory Begins

    Denver Air Quality Generally Good, Winter Pollution Advisory Begins
    2025/11/01
    Today, Denver’s air quality is generally considered good, with some periods of moderate levels, primarily due to fine particulate matter. For Saturday, November 1, 2025, there are no current air quality advisories issued for the Denver metro region, and the winter High Pollution Advisory Program has just begun. Officials will now monitor daily pollution levels more closely through winter to protect residents’s health[5][6].

    The Air Quality Index (AQI) for Denver early this morning is in the good range, meaning pollution poses little or no risk for most people. Fine particulate matter, known as PM2.5, is the main concern this time of year. PM2.5 consists of tiny particles from sources like vehicles, fireplaces, and atmospheric conditions that can penetrate the respiratory system. While levels are not high enough to warrant an Action Day or burning restrictions as of now, individuals who are unusually sensitive to air pollution—such as those with chronic respiratory conditions, young children, or the elderly—should still monitor air quality forecasts[4][5].

    The air in Denver during November is typically influenced by colder temperatures and atmospheric inversions, which trap pollutants close to the ground and can create the familiar “Brown Cloud.” This haze is made up of particulate matter and can impair visibility and affect respiratory health. The Colorado Department of Public Health and Environment (CDPHE) issues daily air pollution advisories, calling for voluntary driving reductions or indoor burning restrictions whenever conditions exceed standards[3].

    Ninety percent of the days so far this year in Denver have been within safe air quality limits, indicating a very low health risk for most residents. However, occasional spikes in pollution—most commonly during stagnant weather or when wildfire smoke drifts from other states—can temporarily elevate particulate matter and ozone, prompting caution for sensitive groups[2][3][4].

    Overall, the city’s air is safe for outdoor activity today, but the start of winter could bring more frequent advisory periods, particularly on calm days when pollution builds up. Denver residents are encouraged to stay informed through state forecasts, reduce unnecessary burning, and help limit emissions on poor air days to protect community health[3][5].

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  • Denver's Air Quality Moderate, Particulate Matter Peaks in Early Morning

    Denver's Air Quality Moderate, Particulate Matter Peaks in Early Morning
    2025/10/25
    Denver’s air quality today is in the Moderate range, with the highest recorded Air Quality Index, or AQI, reaching 68 for particulate matter less than 10 micrometers early in the morning. Throughout much of the city, the AQI has hovered between the high 50s and mid 60s, primarily driven by fine particulate pollution. Ozone and other pollutants remain in the Good category.

    Moderate air quality means that air pollution levels are acceptable for most people, but there is a slight risk for individuals who are unusually sensitive to airborne particles, such as those with respiratory or heart conditions. These individuals should consider reducing prolonged or heavy outdoor exertion, especially if they notice symptoms like coughing or throat irritation.

    No air quality advisories are currently in effect for Denver or the surrounding Front Range Urban Corridor. Carbon monoxide and nitrogen dioxide remain well within Good levels, and ozone is expected to remain in the Good category through the weekend. The highest particulate concentrations were seen near the South Platte River corridor, from Denver northward, but pollution levels are projected to improve in the coming days.

    In terms of visibility, conditions are likely to be moderate to poor at times on Saturday in the Denver area, with improvements expected beginning Sunday. The overall health risk for the Denver area today is considered very low for the general population, and 90 percent of the year’s days so far have been within the World Health Organization’s recommended air quality guidelines.

    Outdoor activities can proceed as usual for most of Denver’s residents, though those with heightened sensitivity may wish to monitor symptoms and remain indoors during periods of increased particulate matter, especially during the early morning hours when daily AQI tends to peak. For most, today’s air remains suitable for work, school, and recreation outdoors.

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  • Denver Air Quality Remains Excellent with AQI Levels Well Below Health Concerns

    Denver Air Quality Remains Excellent with AQI Levels Well Below Health Concerns
    2025/10/18
    Denver’s air quality today is rated as Good, with the Air Quality Index in the low to mid 40s for ozone, and all primary pollutants—ozone, particulate matter, carbon monoxide, and nitrogen dioxide—remaining well below levels of health concern. There are no air quality advisories in effect for Denver or the broader Front Range region.

    The most recent measurements report a highest AQI value of 46 for ozone and 44 around midday yesterday, both categorized as Good by the Environmental Protection Agency. Air quality forecasts expect continued Good air quality conditions through the weekend.

    Throughout 2025, Denver’s air has remained largely within the World Health Organization’s safe limits, with over ninety percent of days rated as Good. The average AQI for the year has been 33, signifying consistently clean air. The highest AQI observed locally in the past two days reached 44 at 2 PM, while the lowest, a very clean 10, was recorded at 7 AM. These values reflect the typical daily pattern: slightly higher AQI numbers in the afternoon and lowest in the early morning hours, but always remaining within the Good category.

    Ozone, which tends to rise on hot, sunny days, has been the primary air quality concern in recent years, but today levels are low. Monitoring data from the Colorado Department of Public Health and Environment and the Regional Air Quality Council confirm no Action Day alerts for ozone or particulates are necessary, and no restrictions, such as burning or driving advisories, are in effect.

    For sensitive populations including young children, the elderly, and those with respiratory conditions, today’s air does not pose a measurable risk. Residents and visitors can safely engage in outdoor activities across Denver and surrounding counties. Visibility is forecasted to remain Good to Moderate, and the risk of acute or chronic health effects is considered very low given today’s pollution levels.

    Denver continues to benefit from improved air quality and stable weather conditions, supporting healthy outdoor recreation this October day.

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  • Denver's Air Moderate, Particulate Matter a Concern

    Denver's Air Moderate, Particulate Matter a Concern
    2025/10/11
    Denver’s air quality today is ranked as moderate, with an Air Quality Index of 52 to 58 measured at monitoring sites in the metro area. The primary pollutant for this reading is fine particulate matter less than 2.5 micrometers, with concentrations around 13 micrograms per cubic meter recorded early in the morning. This moderate AQI means air pollution is acceptable for most individuals but may pose a minor risk for those who are unusually sensitive, such as people with respiratory conditions or older adults.

    No official air quality advisories are currently in effect for the Denver-Boulder region or the greater Front Range Urban Corridor, and ozone levels remain in the good category. The absence of advisories indicates that most residents can go about daily activities without concern for air pollution, though sensitive groups may want to limit prolonged outdoor exertion. Recent trends from this week show Denver’s AQI has hovered in the moderate range, with daily highs typically occurring during early morning hours and lower readings later in the day.

    From a historical perspective, today’s AQI is among the higher readings seen on this date over the past years, but it does not cross into more hazardous categories. Weather conditions are mild, and visibility remains good across the area, with no significant smoke events or air quality alerts affecting Denver at this time.

    Overall, while Denver’s air is moderately affected by fine particulate pollution today, public health impacts are limited and outdoor activities remain safe for most people. However, individuals unusually sensitive to air pollution should monitor their symptoms and consider taking it easy until air quality improves further[2][3][1].

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  • Denver Air Quality Remains Good, Pollutant Levels Low

    Denver Air Quality Remains Good, Pollutant Levels Low
    2025/10/04
    Today’s air quality in Denver is considered good overall, with the Air Quality Index, or AQI, reading at 23 during the latest measurement. At this level, air quality poses little or no risk to health for the general public. The primary pollutants measured are particulate matter (PM2.5 and PM10), ozone, nitrogen dioxide, and carbon monoxide. Levels of fine particulate matter, PM2.5, are currently at 0 micrograms per cubic meter, while larger particulates, PM10, are slightly elevated at 38 micrograms per cubic meter, both remaining well within safe limits.

    Ozone levels in Denver are moderate this morning, with a recorded value reaching a maximum of 57 parts per billion during the overnight hours, briefly pushing the AQI into the moderate range at a peak value of 58. These moderate readings occur generally in the early morning and tend to decrease as the day progresses. The ozone level during most of Saturday is expected to remain in the good category, presenting minimal health concerns for sensitive groups, such as people with asthma or respiratory conditions.

    Carbon monoxide and nitrogen dioxide, both traffic-related pollutants, are measured at 140 parts per billion and 12 parts per billion respectively, showing no cause for concern. Sulfur dioxide is at a negligible 1 part per billion, well below any threshold that would prompt a health advisory.

    Meteorological conditions today in Denver support this good air quality, with sunny skies, a temperature around 29 degrees Celsius, low humidity at 14 percent, and light winds at 9 kilometers per hour. These weather factors help disperse any accumulating pollutants.

    Statistically, Denver enjoys relatively healthy air by international standards. This year, 91 percent of days have remained within the World Health Organization’s recommended safe limits, leaving the overall risk of air pollution-related health issues classified as very low for the region.

    In summary, residents and visitors to Denver today can enjoy outdoor activities without restriction, as air quality is firmly in the good range and pollutant concentrations are low. There are no advisories or special precautions recommended for any group. The outlook for the remainder of the day is for air quality to stay favorable as meteorological conditions remain stable and pollutant levels are expected to remain low.

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