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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